better partner ai, better enemy ai, customizible weapons(come on. your a fictional unit. you should be able to chose what you want to use), better side arm mechanics, better co-op, more night missions, more sabotage, stealth missions, recon missions, no medic(i dont use him. it dims down the realism), better first person view(gr first person view sucks. third person ftw), and they can get rid of those gun ship rides. that is all of i can think of now.
and i know my grammer sucks. sue me