Water levels in Mario. They are inevitably in every Mario game. They've been there since the beginning.
Things got even worse when Mario made the transition to 3D.
In 2D, you are defenseless unless you have a fireflower. In 3D, you are defenseless (maybe you can punch?). In both cases, the levels are slow, tedious, and sometimes Mario is difficult to control. The control issues are especially nerve-racking in the 3D Mario games.
I don't intend to say too much other than FUCK YOU UNDERWATER MARIO LEVELS.
I recently picked up Super Mario Galaxy 2, and I can already tell you I will hate the water stages. What do you guys think?