When even I, as pessimistic as I am about Kirby, start to wonder if Peach might be one of his few winning matchups, you know that's not a good sign for Peach.
What blows my mind most about this Greninja hype, is that I thought people already accepted he was basically a "high tier." But now we're gloating at all these supposed Greninja naysayers, who I am not entirely convinced exist. It's been obvious to me that he's a Very Good Character for some time now, but that might be because I played him for more than a day.
http://www.ssbwiki.com/tier_list#Super_Smash_Bros._4_tier_list just on that list (which is official, unfortunately
) I'd definitely put him above Olimar, Wario, Peach, Luigi, ROB, Yoshi, and Falcon. Not sure about the Pits and Lucario. I haven't been following the Lucario scene, but if Gheb says he has good results, I believe him. I personally think Greninja has more potential than the Pits, outside of the obvious Sheik matchup sucking, but Pits have been getting pretty good results, as far as I know. So yes, top 20, almost pushing top 15. Greninja's pretty good.
Yoshi kinda sucks. Falcon, as much as I hate it, has probably been overrated for a long time, because of how much better he is than he was in Brawl. Hopefully I'm wrong, as Fatality just won a tournament, but he's practically the only Falcon that has any results... as far as I know. Again, I haven't been following the worldwide results too closely.