I agree. Bad = tinny, overmodulated, harsh, whatever. Good = nice sound, an enhancement rather than a distraction.
The band Mike Davis worked with in NJ a few years ago.... saw them a few times at the USBands shows and they were, IMO, a good example of how to use electronics, especially for a smaller group. Never really heard any tinny, obtrusive, or "artificial" sounds from them. Especially the year or two when they used a cello in their show. 1) The young lady playing the cello was terrific, and 2) the miking was spot on.