Mechwarrior was fun (if you're in to customizations). If you're up with grabbing a Playstation or X-Box emulator, there are a bunch of Mech series.
Yah I used to play Mechwarrior, but I just found it to be too slow paced. The mechs are just too slow moving.
The Transformers War for Cybertron series isn't too bad and has some flying Transformer levels.