Zerker and conc i agree are BROKEN!! kensai feels more skill based so i don't mind him. he's fun to play and to fight against. he does have weaknesses like his mixups take a bit of time to do and assassins can punish him pretty easy. zerker and conc are just maddening to fight and feel way way op. i think the kensai won't be as strong as the new heroes and I'm a bit scared of these guys...
I play on console. Yes, Kensei can do a lot and has an answer to almost everything, but his entire move set is very reactable. His zone is his only attack that is particularly fast. His mixups take a long time to execute. His unblockable and heavy feints are easy parries and his lights are not difficult to block.