Looks interesting
For me there're too many flags, even if they're low counted. I'd prefer two flags for each team or one flag for each team + one mid flag.
Maybe you could add some more player spawns to make the spawns a little bit more variable.
The other entities looks very good.
Some screenshots...
Red: Wrong bottom texture.
Red: The diameter of all barrels is more than 48 units, so you need to scale up the top and bottom textures. Or just create barrels with a diameter of 48 units.
Red: I don't like the slick surface here. It's pretty strange with the sand texture.
Red: Add clip brushes here.
Green: Misaligned texture.
Red: I'd add a clip brush here, too.
Red: Misaligned textures.
Red: Misaligned texture, too. Move the texture a little bit.
Green: Seems that the texture is a little bit too small. Scale it up a little bit and align it again.
Red: I'd like to see a clip brush here, too.
Green: Misaligned texture.
Red: Add one more clip brush here.
Green: There's a hole
Red: There different places like this. I'd try to change the (sun) lighting a little bit to fix it. Looks horrible.
Red: Add clip brushes here.
Red: Add clip brushes here, too.
Map is online @ [OTB] Beta!