Ever since rito got rid of Kha'Zixs armor boost with his ult he has lost his ability to team fight. While he does have a very good time during the laning phase he struggle trying to pick off anyone who steps away from there team, without getting deleted. He has 0 team fight capability. I miss my lil mantis buddy :D 
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MaizeCraze2 votesA few things.
First, Kha'Zix never had an armor boost on his ult. He reduced all damage by 50% (40% before patch 3.8) regardless of type while stealthed.
Second: Maybe I am reading your post wrong, but it sounds like you are saying that Kha'zix struggles when trying to pick off anyone who steps away from their team. That is precisely the opposite of the truth.
Third, Kha is in a very solid state right now after his isolation radius was reduced to 425. The only other change that I see warranted at the moment would be reducing the re-stealth time between ult casts to 1 second from 2, which is how R worked back before 4.7.
RedTrinketGoneHa1 votesNah they fked Kha when they made his E do absolutely no damage, it use to be so vital that his E did damage when he reset, also the range increase on isolation really fked him bad.
Wind Whistler1 votesNah they fked Kha when they made his E do absolutely no damage, it use to be so vital that his E did damage when he reset, also the range increase on isolation really fked him bad.
Why? After his E resets it should be focused on getting out of harms way, not killing someone else and then having it reset again. We don't need another Katarina.
Big Bang Bob1 votesWhat if his ult made him invulnerable?
Wind Whistler2 votes[{quoted}](name=Big Bang Bob,realm=NA,application-id=3ErqAdtq,discussion-id=694FfsvE,comment-id=0002,timestamp=2015-06-20T21:47:58.034+0000)
What if his ult made him invulnerable?
Lol.
Dragko1 votes[{quoted}](name=Big Bang Bob,realm=NA,application-id=3ErqAdtq,discussion-id=694FfsvE,comment-id=0002,timestamp=2015-06-20T21:47:58.034+0000)
What if his ult made him invulnerable?
His ult used to give him an armor and magic resist buff...but they took that out
Wind Whistler1 votesI disagree. He still has the ability to teamfight, but it's a lot harder. The only time Kha'Zix was ever really trash was directly after the big nerf in March 2014. But they buffed him to being atleast somewhat viable. Even now, I think he's still a bit weak for an assassin.
Dragko1 votestrue...but what you forget is his R gave him a brief armor buff while he was invisible. This was his ability to teamfight. now he has no defense and building armor wouldn't be beneficial anymore because now you need straight AD to kill as fast as possible
grLKQ9ma0o1 votesThe huge buffs recently are amazing. Not only the heal buff, but the isolation buff especially. If you get rolling early, his snowball is just about unbearable to play against. I think they should just reapportion something to give his R a reason to be evolved, but the damage reduction was not good.