Engrossing. The best one in the RF series so far.
I think this game didn't do as well as it could have on others ratings/reviews because it didn't offer the multiplayer online. I didn't find this to be a problem since I've got better things to do than sit around for a few hours getting my A S S blown up by some 9 y.o. in kentucky. The AI isn't bad too and even after learning the patterns, it can still be a challenge on the highest difficult settings. The game allows for various parameter adjustments too to increase difficult in that way if a playa wants. The maps are elegant and varied with each providing a tangibly different kill experience.
The campaign is entertaining, with a decent storyline that's neither too obvious or cliche. There are a couple good vehicle levels, in addition to solid standard FPS action.