A few things:
- Make sure you use a beta extension on your map filename. This map is not done.
- Most of the textures on the blue side are misaligned.
- You have water at multiple heights, meaning reflections have to be rendered multiple times, causing poor performance for such a simple map. Make sure you only have 1 surface height of water visible at a time -- it'll help performance a lot.
- The cut-off barrels look bad. Maybe instead of doing oversized barrels and cutting them in half, you should do more realistically sized barrels (scale them down to 32 units, 12 unit radius, and scale the textures, too) and stack them to take place of the taller barrels.
- No barrel top textures are set.
- Wood plank texture over the water looks bad - I'd use a solid wood texture for that, and orient it along the length of the board.
- I'd get rid of the 2nd flag. It seems pointless when it's right next to the 1st flag and 1 person can guard both.
- Some of the barrel positions seem to just get in the way of moving around the map.
- Some of the lights are stuck partway inside barrels.
- The lighting behind the barrels looks kind of weird - I don't think it works very well with Q2 lighting. A lot of it just looks like light artifacting bugs.