Hadrians wall:
First of all, remove at least half of the burning and smoking haystacks. FPS might suck for some people if you won't.
Second thing, and why i'm not adding it in the current state: Edit spawnpoints and the wall. Either make it inaccessible for both teams or let both get up on it at about the same time. Measure the time if you want to do the latter.
Also, remove the single stairway or add another one for the other spawn. It should also be accessible for both teams at about the same time.
Basically, if one team can make it on top of the wall first and camp it like crazy it's a bad map =P
One tiny thing more: add an invisible wall on top of the "dungeon_cell_c" otherwise people can get trapped in there.