I enjoyed it enough to finish the story, but not enough to stick around afterwards. The survival aspects got to be too much for me from what I remember, especially in the post-game. And I was really disappointed that co-op is so limited until you've played the game solo for quite a while, because the co-op missions were what I was really interested in. But again, by the time I finished the story and was able to do a lot of stuff in co-op, I'd more or less already had my fill of the game.
That said, I do think it's worth playing, especially for a cheap price. It is fun, but you really have to be okay with the survival genre.