They don't like it because the graphics are up to date.
It's not much different than SOF1+2, I don't know why people are hating so bad on it.
Try to remember this is the [H]ard|Forum... where it isn't good enough unless it's Crysis. Much like a few years ago where it wasn't good unless it was Doom 3.
I have read that the AI will melee close up even thought they have a perfectly good AK in their hands. AI will line up front to back and you can shave them off at the neck with some ridiculously powerful guns.
Sounds to me like we are not playing the same game.
Speaking of the gore system, they did a great job on that area. If you were a big fan of SOF mainly because of the gore then you will not be disappointed. This games got some great corpse mutilation. The death animations are really good as well, you can stab a guy in the neck and watch him struggle to hold his wound while he bleeds out.
Not to mention, taking the SAW into the level and watching the limbs fly was one of my all time favorite gaming experiences! The grenade launcher kicks ass too