I went to see Pacific Rim last night and while I didn't love every minute of it, it really inspired me to play more games with big robots, ideally fighting against supernatural forces, though robot on robot violence is okay too.
Hawken looks the be-all end all beast, but I have a dreadful little laptop that can't run most games, so I'm mostly looking at console and handheld games. I have a PS3, Wii U, 3DS & Vita.
So far, the only games I have in mind are:
Armored Core -- I only played a brief amount of For Answer and was overwhelmed and disliked it. I would definitely give it another chance though. Also, I think there's been a more recent AC game since For Answer. [Edit: ok, yeah, Armored Core V came out and it looks pretty good!]
MS Gundam Extreme VS -- a Japan-only fighting game that looks really good! I prefer a game with some RPG mechanics and storytelling, over a deathmatch-athon, but I've heard good things about this game..
R.A.D Robot Alchemic Drive -- this crazy PS2 game that I used to love back in the day. I wonder if it holds up..
Zone of the Enders -- as a big MGS fan, I've oddly enough never played these games. Something about the level design felt too compartmentalized and rigid, but I could be mis-remembering the demo I played back in the day..
Dynasty Warriors: Gundam 3 -- I've always found the DW series very repetitive so I'm hesitant to play this game. I worry that the slow, crawling feel of a massive mech gets lost in a hack in slash.. [Edit: ok I watched bits of the Quick Look for this and I think this looks really cool actually!]
That's about all I can think of. Any other suggestions?