I think the reason this is such a big deal to some people is their almost religious conviction that digital is bad and that if it so much as touches the music, it contaminates the music irredeemably. The fact that many of these people were "fooled" by the MoFi releases makes it such a betrayal to such belief.
I don't care how they achieve a nice sounding release. I find decent most, but not all, of the MoFi reissues I've heard, and that includes both their CD/SACD releases and vinyl albums. Is it their mastering, or their technology, or access to decent source material, or quality manufacturing, or a combination of all these factors? I would bet it is the combination.