Yeah, I think the criteria for quality is as follows:

1. Feeling
Is this music an expression of the auteur's soul? Or was it created in an assembly line fashion for a quick buck?

2. Technical proficiency
In a band, are the musicians virtuosos or two-chord hacks?

3. Versatility/innovation
Do they cover new ground or are they just a concrete imitation? If you listen to one of their albums, is there a range of song types or do they all sound the same?

If ALL someone's looking for is a beat to dance to, their musical opinions are worth nothing, just as a gourmet's opinion on food is worth a lot more than someone who just wants something, ANYTHING, to fill their stomach.