Might as well post my thoughts.
-I sincerely hope Greninja's voice stays like that. It's fine by me and I wouldn't want the VA from Diancie to come along and remind me of the anime.
-Pit's voice is miles better now. No argument there, although it's slightly annoying.
-Love how Robin and Lucina keep their VA's.
-Keldeo seems to have his Vic Mignogna screams from the Kyurem movie every time he uses Secret Sword. It's fine, I guess.
-I swear to god I hear Arceus scream when he is summoned. If that's his raging nerd voice from his movie I'm going to kill someone.
-Fox's new VA sounds off. I know it's his 64 VA, but I'm not driven by nostalgia. Worst offender: When he says Landmaster.
-No complaints about Sean Schemmel back for Lucario, Kenny James back as Bowser(ever since Bowser's Inside Story, I can't hate the guy), or Kirby's new redone accent.
-I HATE Toon Link's voice. It makes Pit tolerable by comparison for me.
-Pikachu's voice hasn't changed since Brawl. It's fine as it was.
-I find myself amused by WFT's dissonant serenity in her voice. Yeah, let's ignore the fact that there are things like a ninja frog or a yellow sphere thing with extremities fighting, that's just trivial information, I wanna do yoga.
Pretty much it for my thoughts.