What's your favourite Mario game?

[Evil Yoshi Toes]

The first Paper Mario is the only Mario game that I can't think of anything I don't like about it. The story is simple but engaging, the characters - even Bowser and Princess Peach - are fun and full of personality, and the gameplay was never annoying to me. TTYD comes very close and there are things about that game that I like more than the first, but ultimately the annoying backtracking in a few of the levels puts it just a bit lower than the first game in my opinion.

Honorable mentions to Odyssey and Sunshine (I know Sunshine has some gameplay problems, but I still love it for its atmosphere and creativity).