Long time UT community members Nanners, Sassmaster, and Heresiarch have taken up the daunting task of providing quality feedback for several community made maps for UT4.
At this point, they have reviewed four maps in all. Each of the maps are painstakingly covered, with discussions on gameplay along with suggestions on map geometry and item placement.
If you are a mapper, these videos are a must watch to hear some pro tips on map layout. If you are a player, these videos will help you understand better why the maps play the way they do and maybe a learn a new trick or two.
Here are the four videos released so far: