Um, there's a ton of stuff in the Armory, and it takes a really long time for an average player to unlock these. It also seems like the "fun" ended right after you unlocked everything. Are you sure you even liked the game at all, or just some completionist? The people who left Halo, left soon after the game was released because they hated the gameplay.
Personally, I'd rather unlock armor through achievements, so I wouldn't have to waste everyday of my life trying to get one helmet.