There and Back Again: A Tale of Red Dead Redemption

About a week ago I traded a couple of games in at Gamestop and bought a copy of Red Dead Redemption. I played it for a total of maybe 7 hours, and then the game got stale. Simple as that. When I first bought the game, I thought it was going to immerse me in a world of the Old West, and it did, to some extent. The problem is that there just wasn't enough to do. The missions were repetitive, and outside of them the few things to do just got boring. I'm selling it on Ebay because it's looking like I'll be able to get a very good amount for it, considering I only bought it for $15 of in-store credit.