Finished on recruit difficulty. The game is fun, and forces you to think tactically. The levels are mostly good, although some of the parts with hostages can be annoying.

The AI teams can't be trusted in challenging situations, so you can't make the perfect plan and then watch the execution. (play doorkickers 2 if you want that experience) I found that the best way was to give the easy parts to the AI, and then clear the more dangerous parts yourself.