A lot of the tone the hi-fi folks here love I think is pretty bad, to my ears.
I agree completely. I really don't like a lot of the tones the jazz cats here enjoy, and classic rock tones in general, guitar and bass, irk me for some reason. But get a little crunch or grit on it and it's like the sound has a soul now. Or put it through some gnarly fuzz and rock the whole neighborhood from your basement jam.
General "bad tone" criteria for me:
Anything unbalanced without reason (it just sticks out)
All fret clank (it sounds great augmenting notes just not as loud / louder than the notes)
Overly clean
and balanced (it's just dull; it should have some character to it one way or the other)
Quirky effects. I seriously hate this. I keep seeing avant-garde guys with so many auto-wahs, flangers, chorus effects, delays, and phasers layered over their 16th licks a proper, in-key pitch never sounds on the notes.
I will also say, I have mad respect for true jazz players and most have good tones. It's just a lot of the "new age, avant-garde" crowd gets too heady and weird. I'm all for experimental, but it's like poetry: When it strays too far away from the fundamental rules of the language your message gets lost.