Fun, fast and hectic.
Reading around with reviews and on forums, you'll probably see people talking about a "learning curve" and how extreme it is. Let me tell you what I did. I bought the game; brought it home, popped it in, looked at the thing that said "Training", laughed, and went straight online. If you can't figure out what do while just a person, then you shouldn't be playing games. After I hopped in my first warhawk, it took me a second to realize I should be playing use the Sixaxis; tweaked the sensitivity; and I was off! It takes you all of ten minutes of flying to get the hang of it; after that you start to fall into your own style. Air combat has the be the best part of this game! Sometimes though I'll just run around as infantry and pick up rocket launchers, which has to be annoying to people; when they're concentrating on other planes, to find a rocket heading for them.
The servers are abundant, and inside; there's always action, it's like being in a war zone, constantly explosions and flyby's keep the game intense!
I wish that the beginning had more customization options; but as you get more ranks, you'll get more options. Took me about an hour to get airmen rank; and from by that time, you'll be flying around picking off people who are on foot.
All in all this is an amazing multilayer game; I hope there's a sequel or more expansions soon.