I'm not a fan of the 'feng radios, either. But, I do know locally there are a couple of hams who use them and, honestly, on the repeater (analog) you can't really tell any difference between them and the other users who have Icom, Yaesu, Kenwood, etc. There is a slight difference noticeable but I think I notice it mostly because I know they are on a 'feng.
Some of the descriptions here are as if they are drastically different sounding and almost unreadable. That hasn't been the experience around here. Perhaps it's worse on DMR than analog but in my experience, listening to some who are using 'fengs, it's grossly exaggerated here how 'terrible' they are. Spurious junk? Absolutely. But sound as bad as described? Not from what I've heard.