In my opinion, the game is fun - but the real gameplay lies at the highest difficulty level. Anything less and the game is really easy.
However, I've yet to see a real use for the strength-mode of the suit besides jumping. There's really no reason for me to super-punch someone unless I'm out of ammo. I've found it increases the accuracy of your weapons (I guess since you have the strength to hold the weapon steady and nullify the recoil) but other than that, I really only use the armor mode, cloak mode, and speed mode to a lesser extent.
The graphics are amazing. On my Pentium D 3.0ghz, 2g of RAM, 8800 GTS card I am surprised how well the game runs. I can turn everything on High (Very High is reserved for DX10 I guess) and can turn off AA (jaggies aren't too prevalent in this game) and have it run great. The only time it really slows down is at the end with the ice boat. That killed my FPS for some reason.
The only thing I'm annoyed about is that in the screenshots, distant mountains look hazy and cloudy (like they would in real life) however this doesn't happen whatsoever in the game. Is this DX10 only?
- - - - - - - - - -
Bioshock, Crysis, Quake Wars, HL2:Episode 2/Portal/TF2, Gears of War PC, Unreal Tournament 3... it's going to be a good Q4. :-)