I don't know where else to stick it. But here's some of the stuff I play thats mecha related:

C21: (online MMO FPS/RPG hybrid) PC
http://youtube.com/watch?v=jwNeqhSoRrM

SD Gundam Online Capsule Fighter: (more of a multiplayer game) PC
http://youtube.com/watch?v=07Dy0a-SIMg

Gundam SEED Rengou vs ZAFT Portable: (2 on 2 arcade fighter) PSP
http://youtube.com/watch?v=aNQK-hj174E