Agreed with everyone who loved it!
The controls are very easy. The powers are a nice touch so you don't have to make a specialized grenade unit or other things like that.
The cut scenes are top notch! Basically, this game will introduce many Halo fans to the RTS genre. It has a great story, the feel of a Halo game (with you being a hero and all), great graphics, and fun game play.
I have a feeling this game is going to be a winner all around! I was originally planning on waiting and hoping for a PC port, but it played well enough on 360 that I will gladly buy this first day!