This is a shameless attempt by FFox to up his postcount. And I will dignify it with a post of my own.
I suck at:
Convincing Mid-east thread posters to lay down their arms
Catching footballs (but not rugby balls)
Civ3
Civ2
Chinese and south-east asian history before 1890
Modern Diplomacy
I don't legally drive, so I guess I suck at driving
Door-to-door canvassing for political campaigns where I'm not the candidate (long story)
Anything to do with complicated door issues (wierd locks, for example)
Cutting tomatoes
Cooking things where "presentation" is important
Any cleaning job that does not show progress
All of that girl-stuff FFox mentioned.
There's a few for a start.
More later, since I do not suck at being humble.