Not quite what I was hoping for...
I've often found myself in need of help, and finding that the AI have no idea what they are doing. They are constantly running into walls, not shooting at enemies right in front of them, and they are always getting in the way. This can make the game quite hard. After playing a game like SOCOM 2, Rainbow 6 Lockdown just does not compare. Online however is actually pretty good to a point, and isn't quite as irritating...
Another major drawback about the game, is the fact there is a lot of content missing that was included in the X-BOX version. On X-BOX, there is a large number of ways to customize you character for online play, and there are also different classes of person you can be such as a medic (To my knowledge). Also there are awards to be earned an other content.
Overall I would not really recommend buying this game, it just was not worth it for me.