1) Super Mario Galaxy:
It blew all my expectations when it was released, and they were very high. It was so much superior to any other 3D platformer from all periods.
2) Super Mario Galaxy 2:
Better than the first game, but did not amaze me as much because the first one came before. But it is a better game. Yoshi, Mario Cloud were absolutely amazing. The levels were insane. It is the best 3D platformer ever made easily
3) Super Mario 64
At the time it was a revolution, it it still a great game but not in the level og Galaxy episodes.
4) Super Mario Sunshine,
The game was actually underrated, it was a very good but quite unusual game. The water added a whole new dimension but it looked less Mario than the other games. It also had a frustating camera in some area.
5) Super Mario 3D Land
Great game, but more a mixed child from 2D and 3D serie. It really takes a lot of the codes of the 2D games.