Everyone DOES and SHOULD have their own criteria. Maybe such a list brings to mind a place you've never seen and should, maybe. Greenville, SC is surprisingly nice downtown. I've seen Clayton, GA suggested for retirees a few times. Do you prefer mountains or the beach? Do you like seasons? Are you into cultural things?
Where we live would not be suitable for many here, no doubt, but we like it a lot.
A lisr would be better, I think, if titled "Nice places to live you may not know about".