Good game
Well...easy...is too easy. I'm currently at a point where I don't need to actually play because my units are so damn strong. Umm...well...I think I'm at level 30. I'll go to medium eventually though. Kudos for a great game...
To all those that say the aiming is bad- It's supposed to be that way to improve realism. This is more of a stratergy (unit placement, upgrade order) game than a shooter.