What's the best way to improve upon a suit that basically imbues its wearer with super powers? Give him a giant, badass robot to pilot instead -- and that's exactly what the MechWarrior: Living Legends mod for Crysis does. This full conversion mod transforms the game into something almost unrecognizable, complete with a unique story, mixture of first-person and sim gameplay and, more importantly, so so many giant robots.
If you're looking for some more information on the ambitious mod, check out the official FAQ and clear some HDD space. The mod is in beta now so feel free to get in on the fun here.