I have to give credit for the single-player myself. Before it came out, I doubted the single-player thinking "They spent so much time on graphics and mechanics that the campaign is going to be short and stupid," and wow how wrong was I. The tactical spots are pretty cool. It basically says "OK, there is ammo over there. Now you can go around with stealth over THERE, you can use that turret that is placed nicely over THERE, or do whatever the heck you want. Now go!"
The game really is great. There is just the sort of glitches to work out, but I have to admit, glitches will be typical with such a powerful and complex engine.