Still a lot of work to do...
Pluses:
+Addictive gameplay;
+A lot of weapons;
+Different enemies;
+A lot of missions and game types;
Minuses:
-Stupid AI;
-Too many blood;
-Tons of mistakes.
Well, this game could be perfect, if not the things I wrote :).
First of all, the enemies are so dumb that they're usually tryin' to walk through walls to get the player. Besides, you should draw the round which shows the places they see. The game gets too hard when they can see you through the whole map.
When you kill the bastards they blow into several pieces. Cool. Very violent. I thought that such sh*t happens only when you shoot someone with a bazooka or something like it. Well, it's only a graphic mistake, but when the blood squirts around it covers the map so the player can't see the doors! Damn, that was freakin' pissin' me off! I had to turn the blood off so I can play normally!
The sound needs fixing: first of all, you need to add music. It's impossible to play without it. When you fire a firethrower in anyone the dude begins screaming the short scream repeatedly.
I won't write about all the small mistakes I've seen: the long reloading, problems with changing weapons and other, because you'll fall asleep reading this.
Besides, the game COULD be just great: you made a lot of different interesting locations and game types: I loved the bloody games with zombies, demons and other creepy stuff! You did a perfect work!
The animatoon still sucks, but damn, there were a lot of different characters! That's very good! And the big amount of different weapons rocks!
Anyway, good job. You only need to fix the damn bugs and other incorrect stuff. I voted 4. Good luck!