The biggest problem with Aliens: Colonial Marines is simply that it isn't fun. Not at all. You could play the game from beginning to finish, laugh at its many faults, and finish it without too much trouble, but at no point would you really enjoy yourself, unless you're the blindest of hardcore...
+ Cool soundtrack; + Plenty of Aliens references
- Nothing is fun; - Looks awful; - Combat is generic and boring; - AI imbeciles