17. Super Mario Odyssey
This newcomer game comes in at #17. If failed to rank higher than the other Mario games due to a post game that just isn't compelling. The beauty of this game is that it's basically a Mario game with 30 different power ups. This means that every five minutes of every level you are doing something a little different, than what you've done before. This helps to keep the game feeling fresh throughout the 20 hour main story. There are only around 13 levels in this game, but they are all massive and bursting with hidden Moons to find. But why am I talking about this, when Dunkmaster 5000 does it so much better?
16. Super Mario Galaxy
Super Mario Galaxy takes Mario into a whole new plane of existence with the genius gravity mechanic. Jumping around and between planetoids, abusing the different gravities to do different things just felt so fresh and unique at the time. The bosses are all excellent, and fairly difficult. Even that piranha boss at the start of the game could nearly take you out on the first try. Once you beat the game with all stars you get to play again as Luigi, with a higher jump and harder areas. Oh and that final boss battle with Bowser is the best fight these two have ever had.
15. Valkyria Chronicles
A beautiful engine, with a unique hand drawn look to it. A turn based battle system that adds all the great things about RTS battles without any of the downsides. IMO this is the best turn based strategy game ever made. The way this game works is each character has a turn in which you can freely move around the map ala a 3rd person shooter. How long you can keep moving is determined by your class. While you move, and while enemies move the opposing side can counter fire at you. This means you get the RTS advantage of having positioning mean more, with the turn based strategy advantage of having time to plan out your next move.
