I don't mind a little fret buzz in a band context ... It's generally not even heard, or at least doesn't stick out. But when I hear someone playing a solo bass piece with lots of buzz, I turn it off. It's annoying, and not a musical sound. I'm not talking about hitting the strings hard for percussive effects, but just an "always-present" buzz ... I hate it. I do a lot of solo playing myself, some of it in fretted bass. I like my actions extremely low, but it has to be high enough that when combined with solid technique I don't produce that sort of fret buzz.