There's something off about how the framerate looks to me. Like they removed the Coconut Effect of making the show grainy to look more like a professional film. Something they've done with all CGI movies, actually. Like when I saw Beetlejuice on an HD TV at someone's house and the HD filter took the film grain away and it looked like a cheaply taped daytime soap opera. I don't think I like the look of that.
But I agree, I loved Alvin's Wild Weekend. It had the right amount of cartoony to grounded humor, and I genuinely felt something when Dave angrily crapped all over Alvin's father son one on one bonding experience, causing Alvin to run up to his room, extremely hurt. We got some great Dave being driven crazy in this episode, too. A solid Alvin and the Chipmunks cartoon all the way around. Loved Simon and Theodore being absolutely disgusted by the fact Mrs. Miller was watching them.
I also liked the bike theft episode for expanding on the even worse version of Barney Fife they have as a police officer, giving him something more than just being a gag character, but not by too much.