Well, I guess the comments should be directed at your brother-in-law. In that case, the map is essentially a glorified killbox (or rectangular prism), with a bunch of rectangular brushes randomly strewn throughout, not to mention the horribly tiled textures and uninteresting lighting.

Just to say some positive things, though, the tower in the center looks alright, and no one can exactly call it a literal box (since it's rectangular :\).