I don't know for sure but I think the problem is that basically almost all of their Italian stuff has been done by LVR in Italy and their scanning equipment sucks. The results vary a lot between the films but they would all look better if handled by some other lab with different (better) equipment. I don't know if BU doesn't realize the transfers suck or if they are forced to use LVR by the rights holders. Or if they care....
Reviewers who give good scores for the PQ for the releases are simply wrong.

Inferno for example looks good but the scan was made in the USA.
Raro USA has the same kind of problems or actually maybe even worse. The Hanging For Django "new 2k scan from original negative" Blu is a fucking joke. They certainly don't seem to care.

And fuck the reviews.

I don't know what lab they use but it wouldn't surprise me if its LVR. I can think of only like 3-4 releases from them that are good enough for me and the scans on all those were very likely handled by some other company and Raro just distributes the discs.
Arrow UK also used these shitty transfers in the beginning but they actually did something about that and are releasing quality now.