I plead guilty to hitting the guild lords door and sprinting off. When your team is behind and or losing at sanctum it can relieve pressure. I've yet to play with an organized team on vent or otherwise, so I am always pugging it.

There have been times when I've taken the door and soloed most of the guards before being attacked however, which has been beneficial even when I failed on the guild Lord, because it gave my team and I an easy shot at the guild lord later.

As red, I typically dash for waterfall, take it and run for the other teams guild door for a quick "knock-knock" and then move on to center. If no one is around and I've taken the door down a bit I usually stay with it until the door is down for reasons stated above.

My ranger build works great on this map: Axe/Warhorn/Shortbow with earth sigil, hydromancy sigil, and energy sigil and one utility dedicated to AE control for slowing people down. I take the spirit elite for the group rez and condition cleanse. My 6 runes of Lyssa give me removal of all conditions and getting all boons when using an elite. Popping my elite at sanctum has turned the tide at sanctum every time I've used it.
http://www.guildwars2gold.org/