Found this gem at smashboards:
Typs said: ↑
Ok, i'm not going to beat around the bush, the fact that Greninja is a playable character is, in my opinion, the stupidest thing I have seen in this game so far (and i hope it will stay that way).
To me, Greninja is just a face in a crowd of 718 people that doesn't stand out at all. He got in because nintendo wanted to advertise Gen 6 and took the "coolest" looking pokemon, and even if he is better than average he doesn't stand out as much as Lucario, who was way more popular before brawl than Greninja was 2 days ago.
Speaking of popularity, Greninja wasn't even rated once in the "Rate their chances" thread, while Zoroark was rated twice. His support thread (created in november) barely reached the second page before his anouncement, with the last post dating back to the end of january, Hawlucha (another Gen 6 pokemon) did better than that.
All i want to say is that i don't feel like Greninja deserve to be playable, his design isn't that interresting, his role in pokemon X/Y isn't special, and he isn't popular enough to get in.
However, i know some people are happy with his inclusion, so i would like to see how much, and, most important, why.
(i think i made some mistake with my english, sorry about that.)