The Structure is, I think, my best map so far. It's got turns, twists, two bases, plenty of places to shoot and be shot from, multiple levels, and a decent stronghold area.

It's only operational for Team Slayer and Capture the
Flag so far, but that's because I'm impatient. I'll update when
I make it playable for more gametypes, like Infection, FFA 
Slayer, Assault, etc.

UPDATE: More gametypes to play! The above is now a lie. I'm sorry for lying.

It's sort of like a mix of Construct, Narrows, and Blackout from 2 and 3. Maybe a few more thrown in.

If you download, please don't forget to Like it on Bungie(they have a thing for that). Also, please post your feedback here if you could. Also, don't forget to check out my other two maps while you're at my fileshare. ;)

Features:
Symmetry
2x Man Cannons
Overshield Powerup
Two Bases
Multiple Levels
Plenty of Awesome*

Weapons:
1x Snipe
1x Rockets
1x Shotty
3x DMR
2x Needler
2x Magnum
2x Assault
2x Plasma Nades
4x Frags

*based solely on my opinion

Video:

YouTube - TheStructure

Pictures:

Here's an isometric view looking at the various levels from Red side. In the top middle of the picture you'll see, if you look hard enough, an enclosed space under the Rockets platform. Shotty is in there, on its own little altar. Because it's special(not really).

Here we have a nice view from the back end, looking at Rockets and Shotty, Red Base on the left and Blue Base on the right. Snipe is in the back of the shot, opposite the open area from Rockets.