It's only academic (and unreliable) if you're trying to compare engines dyno'd on different dyno's.
Yes, in an ideal world, you'd compare back to back, same dyno, same day and same ancillaries (carb, exhaust etc.). But proper dyno software corrects for air temp, preasure etc. and many engine builders will dyno with a specific "test" carb etc. again to make it easier to compare result between engines.
So base question holds "what are good, bad and ugly dyno figures" the caveat being for each engine builders I.e. What's good, bad and ugly for, say UFO but don't expect the figures to be the same for RPM, Force or whoever.
Finally, different dyno operators like to compare engines in different ways; rpm, seem to like mean power, force used to use area under the curve (it has a mathematical term that I can't remember), some others use pull or run time i.e. How long it takes the engine revs to rise (pull) from one designated rpm figure, to another higher designated figure. All of these three, quoted figures, are intended to show the real comparative usable power of an engine, rather than peak power, that might not lead to better lap times.
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