There are number of releases that are sort of compilations, but I don't usually even think them that way. Easy example Merzbow Metalvelodrome 4xCD. Putrefier 4xCD box. M.O. Five Years Of Slaughters LP, Kraang LP's, Satori "Infect", above mentioned Dagda Mor. Countless more.
Also question when compilation is "acceptable" and when its sort of sampler? Let's say Con-Dom "Prince of our disorder" 3"+tape. Tape is compilation of live material, but since these were never released in full it is quite different from making best of -collection of formerly released material.
Not fan of edited or butchered albums. Think for example putting out Club Moral LP and removing nazis of the night from LP.. wtf? Even if its for legal reasons, would appear better to then leave reissue to labels who can do it properly.
I do prefer full release of original tapes as opposed to best of, but in some cases latter is fine.