Scoring is an issue. I don't know how to address it, but I've taken over old pages that were lousy and got lousy votes, and improved them a lot. But they still have an overall lousy score because people don't revise their votes, or people who placed lousy votes don't really visit the site anymore, etc. I'm not exactly sure of the benefit of the present scoring system.
As far as a Wiki system goes, I wonder if that will allow people with big egos to completely change a page. There is a lot about a mountain or route that is subjective, and people get pretty big heads and can be very prideful that their mountaineering knowledge is superior to someone else's.