No such thing as stupid questions...that's what forums are for
Loading maps onto the site would violate copyrights, but it is not impossible to get permission (especially if something is offered in return, like error reporting). How would that be useful to you though - is it that you'd want to check out areas where you don't have your own copy?
Gear reviews has come up before, so I guess there is something to be considered. The best is to have it member-driven (like it is on the link you posted), i.e. that members can post an item for review, rather than just being able to comment on an item which the site admin has decided to post.
The question for me is: does a regular forum like this provide a sufficient framework to do these reviews, or is a dedicated component better, one where you can upload a picture, do a basic report, give a rating, and others can comment or post their own rating on the same item?