So, first off, this is basically its own game. Technically, it's a DLC, true, but it contains it's own story, unique mechanics, etc, and you don't need the original in order to play. There's actually a lot of character growth and side story action that is surprising considering the length of the game. Every character that you interact with has their own little background and side story that unfolds as you go. It adds a layer of depth that you simply don't expect from a shooter like this. That said, here are the pros and cons:
Pros:
-Wish fulfillment
-Great fun
- Interesting mechanics
- Good story
Cons:
- Some of the ragdoll physics are kinda sketchy
- The AI is dumb. They just run at you. The game is made harder by throwing different kinds of enemies at you in waves. Eventually, they spawn behind you sometimes, and that can make things difficult. This game would have almost unlimited replay value if the AI were intelligent