Can a great system make a mediocre recording sound good?

I'd never want a system that could only sound great with the best recordings. To that end I've always voiced my systems to sound GOOD with mediocre recordings since this is where the vast majority of music resides. As I and others have mentioned, get the timbre, tonality right and  mediocre recordings can be involving, great recording simply follow along and become even more involving.

Mostly, I want my system to be musical, certainly I seek maximum resolution but not at the price of musical, I do believe these are not mutually exclusive goals.

For me it depends on what makes a mediocre recording mediocre, by the way, I'd judge a large proportion of recordings as mediocre. I've found mediocre recordings that formerly had timbre, sound staging and/or were less resolving have become much more listenable. A highly resolving system with more natural timbre or tonality will uncover information previously unheard, and presents recordings in a more forgiving manner. Recordings with these defects become more involving.

Quashed micro dynamics is one defect that's been heightened by a more resolving system. I find far too many digitally mastered recordings to suffer this malady, I can only take these recording in small doses, consecutive plays of these recordings causes me to lose interest, have to return to known high quality recordings to return to involving listening session.

Poor recordings remain poor, no help can be found for these.