Command and Conquer 3.
VERY action packed. I had no idea how much the gameplay differed from other RTS games.
I really like how you can fly in crack teams of soldiers behind enemy lines. It really changes up the game play.
All in all it's a very fun game so far and very well balanced.
One a side note:
I understand now how Sega tried to blend all that was good in Starcraft and Command and Conquer into one game with Universe at War.
Of course it turned into one bug infested mess.
I really tried to play that game Sega. I downloaded all the patches and EVERYTHING. Nowhere near as good as Command and Conquer 3 though.