You should add some actual geometry to play on instead of one huge flat brush. There's nothing to stand on or hide behind, so sniper is the only class people are going to play. The distance from spawn to point is pretty okay, but the map is far too wide. I don't see any use for those dead-end rooms in the corners, either.
I also suspect your map leaked. Go to Map > Load Pointfile to see where the leak is, if you have one.