I uninstalled it today. I hadn't played it for a while and if I remember correctly, the beta ends soon anyway. I lost interest, but it's no fault of the game. I played it for close to 20 hours, maybe, and that's about as much as I can put into a game before growing bored. It did well to hold my attention for so long with just the one map, really.
The gameplay, I felt, was a big step up from my experience with Call of Duty 4/MW2. The perk system (as well as the killstreak rewards) bug me in the Call of Duty games. I liked the vehicle combat, as well as the destructible buildings.
I don't know if I'll buy it or not yet.