I have a lot of strong commissions in my collection, mostly due to the fact that Micronauts aren't often requested, and lots of artists groove on doing characters that they haven't been asked to draw a bazillion times. You can thumb through my CAF gallery to see for yourself.
That said, commissions, especially convention commissions, are always going to be a bit of a risk. Lots of factors can be at play. The amount of distractions, the amount of the fee, the skill, and the degree of interest in the subject matter all figure.
My most disappointing commission piece is by an old Micronauts artist (whose last name rhymes with... ahh... 'bacon') who delivered a subpar effort, IMO. Considering his background with the property, I'd expected something stronger and more confident. In his defense, I'm certain he wasn't particularly interested in drawing the character at that time, and he insisted on only accepting $35 for the effort, IIRC.
SO, maybe a little apples/oranges to the OP's point. It's easier to be content with a $35 effort from a legend, and file it away.