I never heard anyone complain about Twitch's rework, but that's probably because he was reworked... like... late season 2 and it was a rather big improvement. It was overshadowed by Evelynn's rework and Zyra's release though, both had happened in the same patch as Twitch's rework...
Most people like to say every rework is a failure regardless of it actually was. Cass wasn't actually a failure since prior to her rework, she was a niche pocket pick that got destroyed by anyone who bought boots since while her Q did 80% of her AP with the same base (Currently does 45%, though rework had nerfed it down to 35%) it had a delay between .25s and .6ish second. It was unreliable and if anyone got boots, it was dodged easy, though most will complain anyways because it was like the old Nidalee spear, though a hundred times less reliable, BUT if you hit with that poison, it by itself would half life anything really and she still had the same E that she does now, so she had an 80% on her Q, 55% on her E, and her W had more base damage and did 5% AP per tick more back then. Her old passive was useless and her new one is now amazing. Honestly though, people just remember when she was reworked, the Cass that was brought had almost no damage and her passive was just playing Farmville by W'ing at minions then E'ing them for last hits to stack it. After she had her Q reliability fixed and it's AP ratio buffed, her E given a static ratio rather than 30%-60% based on ability level, plus her passive reworked again to be incredible and reward her for interacting with her enemies, she's been amazing. One of my friends mained Cass pre-rework and post and prefers the new one, but most would rather complain and demand the old 80% ratio so they can spam poisons from a distance and never have to worry about pressing W or E, just Q'ing and walking away. >>
Morde is considered a failure just because of how toxic his kit is. It's got no CC, so playing solo with him is just... it's horrible since he has no mobility either. He's slower than hell and needs a Trinity or a Luden's PLUS a Rylai's to keep up on his target or else he's just Q'ing a minion twice then flashing over to AA+E+R for the kill on a squishy, which is as toxic as it gets. There's nothing satisfying about the new Morde other than pressing Q and then flashing at a squishy for a one shot. That's seriously it. He's got nothing rewarding in his kit for any kind of plays other than Flashing and landing the 3rd Q. Seriously. His kit sucks.
Karma was considered a wonderful buff and also a failure. Why? Well, she's perfect kit-wise, but we lost the fans. Literally. We lost the fans. x.x We all miss the old Karma's fans and even though we love the new kit, we can't get over the loss of the fans. QQ
Evelynn was considered a success at first, but as time has gone by, I'm pretty sure we can all agree we'd rather have the old 5 sunfire and Evelynn than the current one that's been nerfed every damn season since late season 2.
I'd mention Trundle and Sej, but those were mostly visuals and we'd all agree they were successes.
Sion was a huuuuuuuge success.
Heimer and Xerath are debatable. Heimer was well off before and now he's even more well off, so I'd say a success. Xerath before was a bit overly immobile and his passive gave him armor for AP, which was near worthless unless you were against a Talon, but even then you weren't doing so hot. So, I'd say a success.
Darius, Garen, and Skarner are all doing incredibly well and just need number tweaks rather than a whole new kit (Cough, Morde, cough.) so I'd say they're all very, very successful.
Miss Fortune had the world's worst rework to have ever been done. She was already at a low pick rate, but after they 'reworked' her, she became garbage tier and stayed at garbage tier until they finally added an AD ratio to her R. It took a year, but we're all pretty happy it finally happened again, though AP Miss Fortune mains will stay hate their life and wish for the old MF since there's still no AP ratio on the W. AP MF Mid will be missed. RIP SivHD AP MF.
Katarina had a good rework. No one really complained about it, though we still get the backlash of people complaining that she's too easy and OP as heck, etc. etc., but I'd say compared to the old more AD looking kit, she's doing pretty well.
Ashe's rework was obviously a success... so much so that everyone wants the other ADC's to have her crit mechanics....
Jax never had an actual rework, but the loss of dodge was sort of a rework in itself... So, a success since he's still played?
Ryze has been reworked twice, so... I mean... Obviously one of the reworks was a failure, but I wouldn't say the new Ryze is all that great. He does really well, but eh.
Viktor's rework was so good, most have called him the Sleeper OP and have been waiting for huge nerfs. We haven't seen the nerfs, so a success so good that Riot hasn't acknowledged it yet?
Sona sorta got reworked and considering she's been nerfed to hell and back and hasn't seen much play at all, not even when her ultimate skin was released, I wouldn't say it was a success...
So... Well... The big reworks like Xerath, Heimer, Sion, Ashe, and Viktor, I'd say were successful. Their smaller ones though were mostly good, with a few exceptions like Morde who really wasn't reworked, he just had his E nerfed, W gained a heal, and his Q does a ton of damage while his entire problem, not being able to stick to a target or even get near it, wasn't fixed on purpose.
believe
) can stop a split push and keep him from teleporting to his team to help by killing him while he channels his ultimate. It used to be so powerful, but now tanks are just being shit on by Riot with all this true damage, % max HP damage, % max HP true damage, and general overall nerfs to tanks, because god forbid I survive for a few more seconds because I'm a tank, and I build tankiness to do that.
, but I don't know of any others that were really devastating. I know 
hurt some folks, but that was before my time here.
Would you mind filling me in?
