I'm sure I'm in the minority, but I prefer this to the original by quite some margin. I never had any problems with the controls or Wario being clunky.
I also felt that there was a sufficient amount of substance added, especially compared to some rather lazy Nintendo ports. It's got significantly improved graphics, 30 new stars, four playable characters, new stages, mini games, multi-player modes, useful tweaks...what else is needed?
I understand the control issues even though they don't apply to me, but the idea that this was lazy or a tech demo confuses me. I still play the multiplayer mode with friends on occasion and give the single player mode a spin. It's all opinion and expectations, I guess.