I've still not finished 3D Land. So I don't think I'll be getting this.
It's weird, the "proper" 3D Mario games, you had to tear me away from them. I almost didn't want to finish them because I knew it would be over. These and the NSMB ones leave me cold. I do a level, have a reasonable amount of fun, but then I stop playing because I can't be bothered anymore.
Don't know what it is. They're not bad games by any stretch. But they never pull me in and keep me playing.