His outfit in KH2 was kinda a mess tho lol, it certainly wasn't mature. So I agree with changing it. Same with the others tbh. The KH1 outfits were just outlandish, minus Kairi?, and KH2's were just anime teens to the extreme lol. These new outfits are like....almost things a real human would wear, so I like them a lot personally.
I guess I would have been down for Riku's outfit having no sleeves or something to show off his muscles lol, but I mean I am 26 so I ain't into 17 year olds fictional or otherwise so I don't really care lol.
As for his personality, yes I love it. KH1 Riku sucks. Every other game he has been way better. But he still had so much self doubt. I mean, I assume he still sorta does, but its nice to see him take charge and be confident in his role now.