Not so much what OpenStreetMap has done, but simply due to the nature of the project one big difference is, that OSM maps what is on the ground. So there isn't going to be a discussion if that river is relevant or not, if there is a river you map it. Other things like opening hours here are usually also easy to verify, IF you do so. So it will be more if it belongs into the database or not, but even if it doesn't there is often no big harm if tags aren't misused.
And then there are Quality assurance tools:
http://wiki.openstreetmap.org/wiki/Quality_assurance
Right now most of them are more geared toward detecting accidental errors, but it is pretty safe to say that once OSM becomes more popular there will also be tools optimized to detect vandalism.
I also feel like it's a lot easier to get in touch with the community, at least here in Germany: http://www.openstreetmap.de/community.html I actually still haven't found a simple German Wikipedia Forum where I could just discuss a page, which is something that really helps new users.