Be honest now.
I suck at Yoshi's Island, hehe, I had enough trouble getting through the levels up to the very first boss, and when it came to the next area I gave up after a few tries. I think my problem is I tend to run around too much and not be careful so I ended up dropping Mario all the time xD
I also suck at all those first person shooter games, Quake and Half-life and stuff, I can never work out the angles and controls at the same time, and end up losing myself/other people. I suck at a lot of games actually, but that will do for now.