[quote name='miriamleo']Carcassonne, AfterBurner, Castle Crashers, Risk Faction…. which one/two to get?[/QUOTE]
I can't speak for Carcassonne.
After Burner is a fun arcade game, it's more for a pick up and play every now and then game.
Risk Factions is awesome, but the net code was utterly broken when I was playing it. If it's fixed, by all means, buy it.
Castle Crashers is still my favorite XBLA game. Total blast with 4 people locally. Not bad online. A lengthy adventure mode. A ton of characters to play as and level up. If you are up for a beat-em-up, get this game.