Again, not that the shooting is any better. Fighting off hordes of angry terrorists ought to be at least a viscerally pleasing experience, but it just falls flat, thanks to the limp weaponry and enemies that range from brain-dead to superhuman. Enemies are good at finding cover for the most part, but in some ways the game might have been better off without this bonus because it's already hard enough to take most enemies down. You'll actually be happy when the artificial intelligence randomly screws up and gets stuck running around in a circle or up against one environmental object or another--it'll make your life a lot less frustrating.
To make matters worse (or perhaps better, when you consider how frustrating the game can be), there's no element of surprise or unpredictability throughout any of the action. If you walk into a room, you will know where the bad guys are going to come from before they even step foot into your field of view. Any time there's a door leading to nowhere, a random corner that you haven't investigated, or any other sort of hiding place, you can expect terrorists to spawn there wantonly, because they will. Even better (or worse), the game practically waves a flag in your face to let you know enemies are coming via a significant drop in the frame rate every single time new enemies spawn. Between the weak shooting, predictable enemy spawning, and generally unimpressive AI, you're not going to have much fun playing this game.
The one thing that Without Warning has going for it is an entirely decent graphics engine. Given that it takes place inside a chemical plant, it's unsurprising that the environments would be styled in bland, industrial color tones, with lots of crates, barrels, and whatnot littering the areas. But for the most part, the game does a good job with all of these things. It may not be the most aesthetically pleasing environment, but all the different set pieces, breakable objects and environmental textures are nicely detailed. The character models, however, are a different story. The main characters are decently put together--despite the fact that their mouths never move during cutscenes--but the enemies are just plain ugly. They animate stiffly, barely react to getting shot (save for a few overwrought death animations) and upon close inspection, reveal horrid-looking facial maps and bodies. On top of all of this, there are the aforementioned camera and frame rate issues, ultimately negating a lot of the graphics' appeal.
Playing as and experiencing scenes from the perspectives of six different characters is an interesting idea, but Without Warning wastes it entirely.
The audio is mostly awful. As mentioned before, the voice actors used for these characters are beyond cheesy. Nobody sounds like they actually should, and every line is delivered with the kind of overly edgy intensity that would make Paul Walker blush. The terrorists occasionally mutter anti-American epithets and scream "Kill the soldiers!" in entirely indecipherable accents, but that's about it. There isn't a lot of music in the game, and what little is there doesn't make much of an impression. The sound effects are the lone standout, with some intense explosion and gunfire effects, but they aren't enough to salvage the audio presentation.
Without Warning can't be blamed for wanting to try something a little bit different than the average shooter--the problem is that the only thing it does differently isn't done very well, and the remaining components are so generic and hackneyed that they completely murder what small measure of originality the game has to offer. It's a dumb, frustrating, and boring game that clearly needed a lot more time in the pipes to become something entertaining, and it's not worth your time.