[SP] Fat Turret Revolution
As IanB has said above this map uses a great mix of mystery, humorousness (that's so not a word) and confusedness (there's another). And me and my partner in science who have both played this, thought it was great fun 
And the use of the Fat Robot, well, nothing short of AWESOME!
As the player the choices given make this an entertaining and challenging level that is kept light and fun by the general design of the map and use of the Fat turret. MORE FAT TURRET!!!
To see us playing through this map (in a competitive setting) and noting our favourite bits check out the video below:
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Cute but short, plain and simple. This map has a little of the ambience that so many other maps lack to make them more interesting to be in. Unfortunately, it lacks so much in the way of visual and puzzle design that I only give it a 3/5.
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Basic Mod for playing .vpk files Needs to be updated for dlc2, but still works[/spoiler]