AI still think their best plan of action is to walk in front of you no matter where you are right as you start to shoot. There's some cool new features, one seems like it's straight out of Bionic Commando. Nothing original, however. I didn't even bother to try this out online and I probably won't.
I got 535/1000 playing on normal without a collectible or achievement guide pulled up. I'm sure there's many more achievements I couldn't gotten easily but I'd rather play something else.