Pros: The map design promotes fast game play.
Cons: It reminds me of a minature well... minus the water.
Improvements: There's only a few areas that could use some improvements. First, your points have icons on them to indicate what point is what. I typically love that added touch from custom map makers. However, on yours, it looks like something is wrong with the image and thus, doesn't look good at all. I'd either redo those icons, or remove them entirely. Your map is small enough that it's not really needed.
Second, I noticed a drop in fps near the sniper area on the BLU side. I didn't really notice it on the RED side. I typically get 150 frames per second, and so to drop to 60, that's fairly noticeable. I personally wouldn't care, but those who don't have nicer graphics cards may. If you know someone who has an older card, you might want to see if they notice it. If they don't, then don't worry about it. ;)
The door to the underground middle area doesn't look like a door. I didn't notice it the first run through. I think I'd make it a glass door similar to the ones in spawn on 2fort. That way it's obvious what you're getting yourself into before you go that way AND there's no way people will miss it.
I didn't really notice any ammo or health packs laying around. Maybe there were some and I just didn't see them. But make sure you have plenty near that middle point. Don't go overboard - but enough that players don't feel like it's impossible to find health or ammo there.
Also, the white part of the BLU base (outside walls) seemed awfully bright.
Notes: This map isn't for everyone. 3 points attack/defend like a minature cp_well will definitely have it's audience, but won't be loved by all. Games will be shorter on a map like this than it would be on a full fledged 5 point map. But the quick game play may very well be welcomed by a lot of players.
Good work.

I don't know what's up that guy's ass but quite frankly Volcom, this is your best work to date.

So what if it shares the same style that Valve introduced? That's not what matters, it's how the map itself is played and layed out.