It currently has a lot of bugs and glitches.
The servers are a little unstable sometimes.
The graphics are much better than the older versions and so are the physics. It's funner than AA2 so that's good.
I don't recommend playing it right now because of the many problems - you should give it a few weeks 'till they're done with patching all the problems.
AA is a unique FPS game that relays on Team Playing - If you're not a Team Player and like games that are very fast paced and not very realistic this game is not for you.
If you're looking for the most realistic closest army experience you can get then this game is for you.