Firefight Descent is not your average firefight. With a focus on cinematic vibes and player interaction, this map takes cues from many of the things that made past firefights great.
Dude, I got this map from Halomaps.org, and it's freaking awesome. It currently seems to be unmathced quality-wise, in my opinion at least.
Also, I love the music. It really pulls it together for me.
The only issue that I experienced on here was a couple of spots in the air where projectiles and nades could not pass through, but they're rather easy to avoid unless using a rocket launcher.