I don't know if Lambda has been super nerfed. From what I hear she's much more fun to play as now and she's arguably the best primer breaker in the game. She is still really annoying with a good mid-long range game. As for Tager... He is not REALLY good. He is about the same as CT... What doesn't make sense about him is that his throws are unbelievably good but his combos are not as good as they were before. His new move -- gadget finger -- is not that great since it's not combo-able.
Noel is definitely not as good... she is high risk/high reward character, so there could be some success with some people out there (mainly, R-1). Same as Jin... He's REALLY REALLY weird to play as now... His combos almost make no sense.
Tsubaki is almost at the bottom of the barrel... She's my new main... The problem with her is that she has almost no priority, no range, and the worst DP I have ever seen in a game... Then again, I think jpn rank her above Arakune, and somewhere around mid-high tier... So maybe I'm missing something.
Anyway, Ragna didn't get a real buff... He got buffed by the gameplay changes (mainly, the burst system).
edit: oh yeah... Out of the high tiers, I think Bang is probably the most beatable... I have the least experience with him, but Bang traded his oki game from CT to high damage combos in CS. Ragna is annoying... Litchi is REALLY annoying.