I am *this* close to completely stop playing Greninja until the Wii U version. Every time I am playing on a stage like Yoshi's or Warioware (these come up fairly often in For Glory) I either (while edgeguarding someone) SD because of the accidental wall cling, I mess up my edgeguard because of the accidental wall cling, or I SD because my Up B did not go in the right direction towards the edge because of how imprecise the circle pad is and/or I do Side B instead and SD.
It's extremely frustrating and annoying, even if I make the comeback it's still bullshit. I'm definitely thinking of dropping him on the 3DS, just requires too much precision for so little effort (to execute a Up B properly and/or not wall cling).