IMO Smeargle's hazard setting capabilities, while unparalleled, are in no way broken. It has appreciable bulk, great speed, and access to every move, but its typing and offensive presence leave much to be desired in terms of actually sticking around to set hazards more than, say, twice. Sure, once can be enough, but if that's the case, any other hazard setter would have done the exact same job then.
For all other gimmicks that aren't BP, I have no opinion of them, as I haven't faced them.
As for it's BP sets...
http://replay.pokemonshowdown.com/350cup-182578200 (this was the final of the daily tour yesterday)
yea, they just need to go. I'm suggesting a
complex ban on Smeargle + Baton Pass. If it's still seen as overwhelming w/o BP, we'll look at it again.
Shroomish is not broken. In fact, I think I'm the onyl person that has complained about it before TBK brought it up, and clearly people don't think it's broken in any way.
Do not ban Shroomish.