ComangliaGiraffeRemoving the white fence (http://puu.sh/hmSJA/d76b43a001.jpg) behind both of the big middle rocks would go a long way in making sniper more balanced on the map. Probably not used as much in 6s as in highlander, but in hl most snipers are able to sit on the white fence looking over the rock, have great cover, quickly change sight lines to see every entrance to point and be protected by his whole team. The majority if not all of the other sight lines on viaduct force the sniper to be either more isolated and/or more visible. The fence serves no other purpose but making sniper even stronger and would be great to have it gone.
Don't forget the beast that is Heavy that abuses the fuck out of that too.
-edit-
I'd hate seeing the entire white fence go, I understand it makes sniper horrible to play against though, maybe compromise by shortening the white fence so snipers can only see either left or right not both.
Eh, for once, I think Giraffe has a point. A Sniper who has the cover of their entire team is pretty irritating. Sniper is already strong on koth in general, and it's really not so easy as to "just have the Spy stab him" when there's aware players who press tab and listen in Mumble. Sniper has plenty of other strong spots that they can abuse, they don't need more. :P