Sunshine a washout? Sunshine is perhaps the best 3D Mario - especially in HD @ 60FPS.
"What are you talking about? Sunshine's like the best one!"
The music is cool and the setting is refreshing. The FLOOD gimmick is fine; it's nice to have some variance in Mario's move-pool. The weird tone can actually be endearing.
But it's not enough to make up for the in-intuitive level design and wild difficulty swings. A Mario game is expected to be one thing above all else "Fun Running And Jumping Puzzles" and Sunshine simply doesn't deliver.