Bone Hill has so many good features - but, unfortunately, it takes a big hit for readability with its organisation.Bone Hill as written is hella deadly for raw 1st-level types. I'd usually want them to have at least one or two adventures under their belts before hitting that one, just so they've built up a level or two (maybe) and some gear (definitely).
On topic: it's a shame Bone Hill isn't even on the outermost periphery of the "most-played" discussion, as it really is IMO one of the best modules ever in terms of design, (re)playability, variety, and just plain fun.
Cheers,
Merric