The title says it all.
There is always someone better than you at just about anything. But it is easy enough to figure out who is the best in a small group of people. And it is arguable that it is the only setting where your skill level honestly matters.
So how do you stack up against them?
Are you amazing/terrible at (fighting games/shooters/rpgs/puzzles/trouble in terrorist town/etc.)?
Or are you the jack of all trades, master of none?