There's certainly a lot of flaws, some big (like the AI) and some small (invisible walls), that keep the experience tempered, but as with the first game it has this innate draw to it that keeps it compelling and so fun. I love that co-op is back and better than ever with modes beyond just the campaign, and the new in-game features (like the cover system and collectibles) are positive additions, although I think the health system should be re-worked.
Very nice visual presentation with some minor clipping problems here and there. Some really nice detail work, like the sudden flash of an enemy sniper scope pointed at you, or the numerous things meant to make you second guess if what your're seeing is an enemy way in the distance or not. The bullet cam and the new x-ray system are super cool. Great soundtrack inspired by the original game, although the voice-acting and repetitive use of some of the enemy dialogue gets stale.
A great buy for $50, as it offers a ten-plus hour campaign with good reason to replay as well as a few fun co-op modes.
Even though I think this series still has a lot of room to improve, and there was a lot of little things I had hoped they would have resolved from the original game, SEV2 is still loads of fun and it's addictive.