why is katarina allow to be good in 1v1 and teamfights?

Because half the time she isn't. When the situation favors her, you'd rather have her than say an Oriana, but when the situation doesn't favor her, you'd rather have the Oriana over her. She's either more useful than most other AP carries, or she's more useless than all other AP carries. This is natrually going to be the balanced outcome of a high risk high reward champion.

The only reason it seems like she's so good is because people tend to not notice the fights where she was underwhelming and didn't have an opening to get much done. Then they see a fight where she did get her opening and was able to take 3 people down in a few seconds and get this notion that she's really strong while not considering the previous situation that they dismissed because it didn't leave as much of an impact on them.

EDIT: To specifically answer your question, not dieing to her is your weakness. Obviously dieing is objectively bad to everyone, but dieing versus certain champions is worse than others. Most adcs can come out of lane with no kills and be useful. Most AP carries can come out of lane with no kills and be useful. Even most assassins can come out of lane with no kills and be useful. Katarina cannot come out of lane with no kills and be useful, not unless her team is already winning a 4v5 without her.

Katarina has damage gated by 2 things, her resourcelessness and her resets. Because of these things, she isn't allowed to have the damage potential most other assassins easily reach because her reset mechanic would be too powerful. So she has less damage to work with than a leblanc, or a zed, or a talon due to this. In addition, she also has no form of escape without getting her reset, where as the other assassins are usually helped out a little more through addition jumps, jump reverts, or invisibility. Because of all these factors, katarina without a reset is objectively the worst assassin in the game. But when she gets a reset, she becomes probably one of the best if not the best assassin in the game, because her damage just multiplies on itself.

But without that first kill, she is no where near good enough to compete with other assassins or AP carries. Your team has to decisively lose a 4v5 before katarina can do anything more than throw the occasional Q, and even that can be risky against a team with decent catch potential. So all your team has to do is have their carries position well, and katarina becomes an unviable pick because she can't get that first kills that holds back all her damage potential. This is why she isn't picked often in professional play; she is so reliant on the enemy team messing up, which doesn't happen as often at higher levels of play, that she is useless without it occurring. It's much better to take a champion that is useful in most scenarios, so they can always contribute something instead of being shutdown because the parameters weren't perfectly in their favor.

Also if a katarina is sweeping through your team killing everyone and getting resets, she's either already insanely fed, or any other ap carry would be doing just as well if they came in when the fight was practically over. If the carries are low enough to be one shot and the frontline is hurt from a 4v5, you think an ahri would ump in and clean that up? Of course she would, but for some reason when kat does the same thing, she's called overpowered because she gets resets along through the process. If her damage wasn't gated by resets, people would be A LOT more scared of kat.

why is katarina allow to be good in 1v1 and teamfights?

Most champions are good in 1v1 and teamfights to an extent, Kat isn't particularly amazing at either. Certain champions like are notably better at both. If she plays her cards right she can be game-changing, but the same goes for pretty much every tank, marksman, and mage in the game. Usually assassins and fighters are more terrible in team-fights than duels.

But most assassins and fighters will wreck Kat in a 1v1, just because she can beat some amaze-balls at team-fights mages in a 1v1 doesn't tell much about her 1v1 potential.

what exactly is her weakness?

Best way to describe this? Look at .

Fiddlesticks has more range, very powerful CC, very powerful sustain, and can utilize during the middle of his ultimate. Kat also needs no less than 4 kills to allow her combo to do more damage than a perfect WER from the scarecrow.

Prior to her rework, 's rank 5 max-range Javelin also did more damage than a full combo of rank-5 QWE on Kat. Big difference there is Nid only needs level 9 for 1 rank5 spell, Kat needs level 18.

It's also worth noting most champions that rely on throwing themselves into the middle of an enemy team are either: A) tanks B) can use and still do damage (see ).

Kat's weakness is that her optimal play-style is really tactically unsound. She excels when she kills people after throwing her squishy self into the middle of an enemy team. She fails when she throws her squishy self into the middle of the enemy team and what you'd expect to happen from that plan happens.

It's a very high-risk maneuver. She doesn't have in the midst of her combo, her mobility only comes back if she gets a kill, she's within striking distance of everything by everyone when using her skillset.

All wrong. It's not CC. It's smarts. Her greatest strength is the stupidity of players. Adcs thinking they can solo her (only really one ADC I can think of that can pull this off and that is Quinn). Teams tunnel visioning in a team fight while kat goes around back and pops in. Teams not being cautious etc. etc. Blah Blah.

I'm going to tell you CC. Because being cc'd 1v1 sucks, but being cc'd in a teamfight is instant death to a squishy assassin who needs the resets.

Although CC is good against everyone, it has different levels of "good". CC is highly deadly for a Kat, and she puts her self in easily cc situations in team fights. Have one person save one cc for Kat, and now she explodes in team fights without getting her ulti off for more than .25 a second.

There are a lot of champions like that. Vlad's another excellent example.

her weakness isnt cc realy its interrupting her ultimate right when she casts it, and killing her right at that moment, and thats gets done by the use of cc

thats why katarina is so hard to counter because you need both the interruption and follow up damage the interruption needs to be insanely well timed while follow up damage needs to kill her before cc wears off, otherwise zhonyas and your effort failed

this is why katarina is so powerfull realy, because she can decimate your team in split seconds unless you are set up perfectly to kill her in split seconds and even when you are, its katarina who goes in, and she will see that

so in the end her only weakness is you being lucky enough to kill her

don't stand all lumped together in team fights. peel for ur carries. etc.

Her weakness is a single knock up/silence/stun/suppress/interrupt on the enemy team. That's literally it.

CC screws Kat more than others. CC a tank or bruiser and they are mildly inconvenienced. CC Kat and she's dead. One second is all a lot of champions need to kill her. More than one second is certain death since she can't afford to invest heavily in health/armor/MR unless she's absurdly overfed. And CC actually stops her ult. Compare with Kennen, Morgana, and Fiddlesticks whose ults can't be stopped once they're going unless you kill them but, conveniently for them, they can use Zhonya's DURING their ults.

cc doesn't counter olaf :P

I take Vlad and generally own her.

[{quoted}](name=Kariu Rena,realm=NA,application-id=3ErqAdtq,discussion-id=HKsZYdtV,comment-id=,timestamp=2015-05-20T15:38:06.113+0000)

PLS DONT tell me its cc...it counters everyone

"Guys, I need a counter to red burn decks, but don't tell me to use white life gain."

"Guys, I need a counter to Banelings, but don't tell me to use Banshees."

"Guys, I need a counter to Warlock burn, but don't tell me to use Priest."

If you need a counter, but you don't want the most obvious one, you might not be cut out for strategy games.