finished the campaign 11 hours game play.
good
aliens were less annoying to fight
weapon selection was massively improved and even had a few surprises ( x-43 mike and K volt)
controls made suit powers more available and suit powers felt more superhuman
best looking shooter I have played since crysis warhead (maybe it didnt push the envelope but it still looked good)
fire selector, weapon accessorys, and open battle fields ( some of the best parts from the first game)
Bad
the grenade button doesn't throw the grenade it just equips it
characters were not very interesting and your protagonist was nobody
Overall I would give it about a 7.5. If you stand this game up on its own it is a very fun game. While it is sad that we have lost the amazing graphics and physics of the first game I can understand that catering to the small percentage of high end PC users instead of going for the whole market is not a good business model.