In all honesty, Bad Thoughts?
Q worked because he was an impish force of chaos set up right next to the immovable, intractable straight-faced Picard. It just didn't feel right when taken out of that setting. Sisko isn't anyone's straight-man.
I think we agree: TNG-style conflict did not work on DS9, and Q's character suffered. There were major limits to how far TNG could be replicated by DS9.