Even with all the games I pick up and online shooters I attempt to master, I keep going back to Warhawk.
While ultimately full of so many possibilities, it is VERY difficult to master each section of combat. Personally I love that its difficult. The best way to get good however is not to practice for hours and hours, rather grab a mic and start talking. Have fun with this game and grab others in the server and ride in a jeep together to rush the enemy flags and zones. Leapfrog in the warhawks from flag to flag and get those valuable capture points.
Warhawk is the perfect mix of Battlefield style gameplay with dogfighting that reminds me of the truly awesome rogue squadron games. Very easy to pick up and play, but still enough depth to take time to master all the pro-flight moves and attacks.
With 3 expansion packs, this game offers more and more variety. Rocket packs and dropships are a great change of momentum. If you're on the fence even over a year now after release, buy this game! There are still players who rejoin to play (I'm one of them, did my fare share with COD4 and now its back to warhawk) and the rookie servers have been pretty full since the demo release.