If you didn't you'd probably figure out pretty quick after loading up the compiled map
You've made some really cool areas in this map, but there are some really boring areas too. There are also some issues with flow and connectivity throughout most of the map.
This area is very nice gameplay-wise, but it's just too damn gray. If you do end up making custom textures for this map, make sure to use a little color in the accents and trim.
Two large bunches of pickups, very close to one another. Not really a good thing.
Light can be used very effectively to influence the player's focus. Contrast in lighting, which could be brightness, color, or pattern, tends to grab your attention and make players want to investigate a spot.
Green-yellow colors are usually not a good choice for lighting, most people have a subconscious aversion to colors in this range (the phrases 'puke green' and 'snot yellow' come to mind). An environment that range could work in might be on an alien planet with big creepy insect-like aliens, as in that kind of place you're not aiming to make the player feel comfortable.
I like this area a lot, but it's only got two entrances, and they're right next to each other.
This room is really boring, just a big box with giant shipping containers in it. It might be a good idea to completely redo this and the areas in the pics below this.
Very dark, very narrow, and very linear.
More dark and linear.
After walking through those dark, linear areas, you find yourself at a dead end... that could be more than a little frustrating playing online.
