I love this game. I have not played much, YET and I suck overall, rarely making it through raids. Cheats are a problem and I do hope eventually this can be fixed. I hear a lot about it running horrible and being buggy but I have not seen that yet. Or at least not enough when compared to a large list of other games that have been fully released not just beta's.
This is not a game for the faint of heart, nor the arcade shooter types. I like COD or battlefield as next as the next person, this is not those games. Stealth and slow deliberate planning are required to succeed in any way (and sure mostly I have not). The constant edge of my seat during play makes me keep wanting to play though. even little successes feel like great victories.
It is not a game for everyone, and really not a game for most FPS players. But if you like it's style of play you will love it, and nothing else out there compares at this time.