Hard to read without punctuation, but I gather you said that new characters are good, too. And while I agree (I'm very fine with Shulk), I think that underrepresented series' should get some new reps before we just get more Mons.
We got Lucario last game and lost Mewtwo, which was fine with me (even if I liked Mewtwo more). Adding Greninja (while presumably keeping Jigglypuff) just inflates that roster more (while Jigglypuff is falling further and further from popularity, at least around here). Rosalina makes sense as a character as well (despite my weariness of just throwing in more Mario characters).
Basically, I'm all for newcomers, but I want new (or newish) characters from underrepresented series' (Metroid, F-Zero, Kid Icarus which got one, Fire Emblem, and such), not new Mario or Pokemon characters. As someone termed it in a thread over on the Project M forums, most any fan of Mario, Zelda, or Pokemon will already like the roster as it is. It's the other series' that have less representation, and the series' that don't HAVE playable representation yet (Golden Sun, Advance Wars, etc) that need some love.