I've played a couple of games and I think it is... okay. I like the vision mode thing you have and how that keeps things fast paced, and customisation is good too. I also liked the maps that I've seen, but I have only actually played three of them so far.
The main gripe I have with it is how long it takes to find a game. I suppose to counter this you have to work out when the 'peak' playing time would be, factoring in worldwide timezones, but still. The other thing I dislike is how frequently people leave mid-game, leaving teams somewhat unbalanced. Normally it wouldn't bother me, but when it takes five or more minutes to get into a game in the first place it's a bit of a pita.
Other than that it is a good shooter especially considering the price, and I will probably find myself playing it a lot over this summer and beyond.