1. I haven't gotten all stars on any version yet. xD Stupid rainbow ride is slightly annoying in that way. =P
I've beaten SM64DS 100%. Twice.

Including catching all of the rabbits and playing all the minigames such that I beat the "built-in" high scores.

Is that a true calling or just something you do in your spare time?

@Flipz: That is actually really impressive. I kinda wish I still had my N64 so that I could beat it...
@Legodac: lol
I recently beat SM3DLand, which was a relatively short game, unfortunately. Beating the levels is easy for most of the game, with a few levels (especially the last one) requiring multiple tries to beat them. However, collecting the three coins in each level is also relatively easy. There were many instances where the designers could have made collecting the coins a bit more of a challenge.
However, it is still a solid game.
MarioKart7 is a different story. The cources are really well done, especially some of the later levels. But even the new beginning levels have good designs. Steering with gyro is easy but works much better without 3D. DS style steering is easier for me and more responsive.
The selection of older courses included is good at times (Maple Treeway, Kalamari(sp?) Desert and more), but I wish they had switched some courses. I really wish they had added two tracks from Game Cube: Baby Park and the course where you only do 2 laps (Wario Colliseum?).
I also wish they had made an entire Wuhu Island track that was super long, like an endurance race or something.
The lack of a VS mode and Missions is also dissapointing. Online works well though.