I think the marketing campaign for this game had a detrimental effect on how B4B was perceived by the community. Instead of going for that L4D spiritual successor angle, they should have just done their own thing.

Still, I enjoyed playing it more than L4D2. Especially the combat felt much more satisfying. There's an elaborate "build your own class" system using card decks, although I felt a lot of cards were a bit redundant. The game ran really well on the PC, which is a big plus.

The only major drawback to this game are the characters, which are not nearly as appealing as the ones in the L4D games. Also, some chapters reuse environments, which can get boring after repeated playthroughs.

I'd definitely recommend this to anyone who enjoys co-op horde shooters. Definitely pick up the deluxe edition on sale as it includes two new chapters.