Besides the points already mentioned by other commenters I'd say imperial units all over instead of metrical system being used was a big let down to me for using the site. Given only the US uses imperial stuff it would be reasonable to assume metrical units for any IP not located in the US, unless the site is targeted for american audience.

Also, I'm not sure how multi-trails hikes should be organized. I tried to add the Annapurna Circuit in Nepal which I did a few months ago (and is actually a series of hikes between villages) but I could not figure it out and gave up.

Good work though, don't give up now! I know a lot of people who have been looking for a site like that :-)