I get the first constructive criticism then :)
This map would actually stand as a instagib map, I'd think. It's small and effective. The only thing that keeps it from being ideal in that class is that there are so many dead ends, it gets annoying.
The other major thing is the clip. There's an area that I could've accessed by rifle-jumping onto but the clip stopped me. In-game I'd keep trying because I'd think I did it wrong, and I'd get shot. This map would be alot cooler if it had areas that were only accessable through rifle jumping, and it looks like you had a few but you removed them through the clip, which kinda ruined it for me.
The textures were pretty decent, you might want to work on using... more? Uniformity is a good thing but it gets monotonous.
Decent map, it looks a little small for ctf but I'd be happy to playtest it.
In the future, you should consider making your maps as good as possible, and thus improving them with others' comments. Otherwise it shows you're not really proud of your maps, and if that's the case what's the point of making them?
3/5
EDIT: To be honest I'm surprised it was as good as this. The screenshot was pretty terrible lol, and the comment "omg there's trees" made me think it was like 2 walls and a bunch of trees... :S