I used to think that, then I got a life and bought such great games as half life 2, far cry, dod, counterstrike, and many others. I also bought a good gaming rig to play them on, instead of a an xbox. : P
Now dont get me wrong I love halo2 but there are other games youl grow to like.
then there ya go. Dont go aroud saying you beat a game on one of the easier difficulties and try to brag about it. If you can beat it on Legendary in one day, sure brag, but otherwise sure, obviously the average joe could beat it.