I tend to bass how good a sample is on the actual sound quality. I think the majority of drum samples have the potential to work at some point. It just depends on your mood and the track you're working on.But seriously, I still don't know what a 'good' sample is, I just try to make it fit and see what happens
A sample with lots of headroom, no unwanted peaks and in 24bit IMO is a good sample.
A kick sample that is layered with a hi hat and has reverb on it is a bad sample.