[KaVir]

Well I do actually have the following comment directly above the table:
However I didn't want to clutter the table itself with too many comments. I considered including some default values, but figured some muds might leave them as-is rather than updating them, which would result in incorrect information - better to have less data than wrong data.

You could perhaps provide a script linked from the MSSP page that generates a report of any issues. It wouldn't deal with deliberately false information, like The Isles reporting a random number for "PLAYERS" every time you send it an mssp-request, but it would at least ensure that the fields used the correct format.

It'd also be nice if your crawler indicated MSDP support, particularly now that more muds are starting to add it.