Hello again David,
There are several types of 'good' Bokeh, and many more examples of 'bad' Bokeh, too. It's one of those very subjective concepts, hard to describe perfectly, but you know it when you see it.
Also, Bokeh isn't just one thing, one single characteristic, although that's a common misconception. One distinctive feature is the glowing or airy 'rings' of out-of-focus (OOF) highlights. Sometimes these have a donut effect, darker rims and lighter centers. Most lenses, when stopped down, will show the aperture blade shape, better ones remain circular. Straight or hard-edged lines and good Bokeh are generally not used in the same sentence.
Some Bokeh has a slashing or swirly effect, a dizzying comma-shaped effect. This can be pleasing or 'nervous', depending upon the shape of the OOF objects and their distance from the in-focus subject. Oh, yes, the f/stop, too. Again, generally, the more wide-open the aperture, the better the Bokeh.
A major good Bokeh factor is the 'painterly' effect, the pastel or water-color wash of blended background colors (or elements), like some classic paintings, sort of what you see if you squint your eyes slightly. Again, no hard edges and a dream-like quality, not hazy or blurred, exactly, more like 'blended'.
Last, another quality that's hard to describe but easy to spot; The transition or gradiation between in-focus and out-of-focus. Imagine focusing on an single object that slowly goes from sharp focus (closest to the camera) to completely OOF (furthest from camera). As the sharpness (distance) changes, do you spot the transition, or does it 'blend' or bleed into the next stage without noticeable edges? Does it flow smoothly, guiding the viewer's eye, or are there 'jumps'?
This last is a very subtle and prized quality of good Bokeh lenses and many otherwise-great lenses don't have it.
I've looked for a few photos to demonstrate some of these qualities, here's what I found. All taken with the Vivitar Series 1 90mm f/2.5 Bokina.
Ron