Ok, well I'm not going to flame here. I made a post about my game that is mostly custom media, and it's fallen right down to the bottom because people keep flaming this one. I don't really want my game lost because a load of members didn't like this one, therefore, i'll offer you some useful advice (for the record, your original name was cooler):
Screen One:
-For a start lower the ambience, somewhere about 10 could be good. I'm not saying you should make it so you have to rely on lightmapping to see, but just darken the ambience a bit so that it doesn't look like that one light lights up the entire hanger.
-Get rid of all the big static guns. If I am correct, those are just for show and cannot be picked up. That's pointless, and they look pretty useless if you can't pick them up. Just replace with stuff like toolboxes, and more ammo boxes.
-Sort the lightmapping out for that lamp, make sure you get it exactly right or you just lose a lot of realism.
-Is that a junction box on the wall? If so, move it down a bit, so its in the middle.
Screen Two and Three:
-Great lightmapping

-Again, lower the ambience for more dramtic lighting effects.
-The wall by the staircase looks out of place in screen 3. Replace it with a chainlink fence or something.
-Get rid of the tractor thing. That doesn't look like warehouse machinery, it has a plough on the front. If you can get a forklift in there, it would look much better.
-Water dispenser should not be in a warehouse.
-Try adding some scattered papers on the floor or something.
I mentioned changing the Ambience. To do this go to File/Build Game/Level Settings/Global Settings and then change the ambience field to whatever value you want.
Hope this helps you,
Paul