Well, I don;t know what's going on with the big open right side or the cliffs. If the cliffs lead down (in elevation) to that area, you could put an elevated structure or something on the right side. But for now I just don't get whats going on over there.
Automated defense sounds cool.
I like where you're going with the unlockable doors, too, but I suggest having them unlock larger areas than just hallways. If you made the layout include a few medium-sized areas with multiple entrances to each other, the player could have a strategic choice of which doors to open.

maybe in the massive empty room in the top right corner add some stairs going up to a walk way surrounding it on a higher level, or lower. think about cover, the terrace is wide open. whats up with the weapon choice? and MP5 and then a freakin DMR, who else thinks its a weird combination? just a few things to take into consideration :)

Don't mix Halo and real world weapons.

You should add loadouts to this map.
-Zekilk

Boxy isnt always bad. Maybe make use of some shelves, scenery and dark lighting in some spots to make map come alive. imo it looks quite good right now.

Looking good, any updates on it?

I appreciate the use of a lesser-used character as far as maps go. Good luck!

lesser-used character?