I think what turned me off the most about this was how the graphics weren't that good. I guess you might have been trying to look for something nostalgic, but it just ended up looking cheap. It still is actually a pretty good game. It's mostly because it's done in the style of those old Doom games. You get the sense that you're up close in the action. The designs aren't bad either.
I should have known not to shoot at the explosives. I have never known if they would explode in real life. Probably. There were a nice variety of enemies and I liked how there were humans in there as well. It made it harder to tell who to shoot.