Borderlands without the over the top humor, with Halo style combat, and a more "open" approach to multiplayer. It delivers on those things except multiplayer, which is killed by their insistence on shutting down voice chat in most cases. The only other thing missing for me, and it's a huge thing, is building a world that I care about. They put you in a world that looks really interesting, but they tell you nothing about it other than "there are bad guys, you should kill them". Even if the lore is bad, I'd rather it be there just so I'd have that extra pull to keep going.