Transformers: War for Cybertron 75% off on steam: http://store.steampowered.com/app/42650/ I heard someone mention that it now allows full customisation of your transformers, might be worth checking out?
War for Cybertron is a fun, strategically minded FPS, but it doesn't feel like a MECH game. Fall of Cybertron will probably be great and offers full customization.
Can't wait for FoC. MWO gives my large walking tank fetish a run, and transformers gives me reflex based mindless shooting. Its a heavy metal combo pack.
I liked the War for Cybertron a lot too. Played both coop and competitive and the only issues were the connection problems and host mitigation. Will be playing Fall of Cybertron for sure. Hakiyah summed it up nicely. Fun fact: My longest killing-spree ever AND coolest kill, are both in WfC. About 40 kills as a scientist in conquest mode. Two nucleon shock cannons in row FTW! Coolest kill was while sniping as scientist. See other scientist in plane form, bombing friends. Transform, afterburn to his face, transform, melee him to death midair, transform and afterburn away... like a boss.