the way i seee han is * as * in team fights. okay i can understand thatyou remove the bufs of the opponent but you make your own teammate useless as well. secondly as the OP says root etc help people deal with water cancer currently spreading and han just waltzes in and screws the whole thing up either make his mystery so that he only removes buffs for one round then next round the buffs are back up or else remove the other 3 mains from the game and force everyone to cancer fight.

Also if you say that han can be interrupted r1 i can only think of iruka or samui doing it also i would never perform a mystery r1 action 1 without having the positive knowledge that weather my opponent is faster than me or not which is entirely different than the whole team's initiative.

For real? Calling a nerf on Han? I call a nerf on Roshi then. Inmune to debuffs and control and will raise ninjutsu and armor when hit.
People use him as a tank but he hits waaaaaay too much for that role, far more than others. Want a hint for beating Han? Try applying any sort of control on him.