I don't mind Complex, but I can understand why, it gets so much hate. Same with Haven and I actually love that map. The only map I really don't like is Abandon. Anything besides flood on that map is just horrible.
360 games completed 100% retail: Armored Core 4, FF13, FF13-2, Force Unleashed 2, Halo 3, Halo Reach, Mass Effect 2, Mass Effect 3, The Last Remnant, SSX.
I agree with the BTB placement and DMR fest comments. I do like it though, it does shake things up. However, it is also the map that if you are with some bad players, the spawn killing begins like no other.