1.Alien weaponry. Like I said, none of this is a big deal, jus something I would have liked to see. I love the MOAC/MOAR in the firstt game. They were th only ones, but they were cool and fun to use.
2.Some sort of super-powerful human weaponry. The X43-Mike(correct if wrong name) sort of fit this role, but to me doesn't come close to the TAC Launcher or the Plasma Gun in the other games.
3. A large/tough boss. You could argue that Crysis 2 has a boss by say the Pinger is like a boss, but I mean something really big. In the first game you took down a huge alien ship, but in this game the hardest enemy is like a cross between the Hunter and Scout.
Again, I'm not upset these weren't in the game, but I would have liked to see them.