GG_RAGEBalance: A perfectly symmetrical map. That means that the map is about as balanced as it can get.
Design: There are a few design aspects that I really didn't like. The boxes you used are the exact size so that players can't jump on them (or at least not easily...I think I got on one ONCE by strafe jumping...was really hard.) Those boxes REALLY piss me off, so in the future try using slightly smaller boxes or low-walls instead. The overall flow of the map seems a bit cluttered, so players tend to get a bit lost in the many directions they can go.
Fun: This map is fun when there are a LOT of players. That is the only way to keep game-flow going. When it is just a few (6 on 6 or fewer) the map seems a bit too big, and feels a lot like a maze.
This map will be good for servers that have a lot of people in them. If a server can stay populated for a while, then this map will do well. When there aren't many players on this map will have trouble keeping the players attention. Try making a smaller version of this map without as many random places to go to.