Call of Duty: Modern Warfare II\n\n The difficulty of Bots in MWII are, Recruit, Regular, Hardened, Veteran and Mixed. They currently only use a limited amount of weapons in the game.
There are two methods to get bot lobbies: smurfing and manipulating SBMM. Both of these require time but do not take much effort. You may have to work through some low skill games and face low ranking players along the way. These types of matches are a great way to learn the game as they are easy lobbies.