Corridors are very big indeed, as many comments say. But the map makes more sense in the Alliance mod, and perhaps that is why it was also released in that mappack (ACTF27 here: lvlworld.com/review/id:2271). Then you can enjoy those grapple-runs through those corridors!
Edited 27 seconds after the original posting.

Corridors really are a bit too big, but I mostly had encounters in the centergounds where bots played really well
I aslo think some water in the bases would have been nice too but thats a small thing

I love maps that look like this. This is a very cool CTF map. It actually calms me down when playing against Nightmare bots.

I think it´s worth the download although the corridors are a little too big... a 7 from me :)