Was just wondering as it doesn't seem very consistant...Destruction's Thrash Anthems is listed as a full-length but Anthrax' The Greater of Two Evils is a comp...

I've changed Anthrax's album.

what about Testaments First strike still deadly?

Another good example.

I think I'd favor the Compilation tag for this ...

Helstar's "Sins of the Past" - Compilation. So this seems like a pretty inconsistent thing on the archives.

Some inconsistence is to be expected due to the user input nature of the site.

Those are not compilations, by the way; compilations imply previously released recordings. Otherwise live albums, cover albums, and regular albums where the songs had appeared earlier in demos ought to be called compilations as well.