Most educated people think it is truly great? Do they?
I'll bet a lot of otherwise educated people don't even know the source material. These same people probably think RL created these images himself, instead of basing them off the works of others.
I do love the qualifier: "most educated people outside of a handful of indignant comic fans"...so GP's allowing that there are, in fact, educated people who also happen to be comic fans, indignant or otherwise.
That does nothing for the terrible logical fallacy invoked...the classic "argumentum ad populum" (appeal to popularity)...with the implication being that if you don't think the art is "truly great", the odds are pretty good that you're not "educated." How do you even prove such a claim...? You can't; it's impossible, which is why it is used by poor debaters.
The truth is, there are vast swaths....veritable plethoras....of educated people who have never even heard of Rob Lichtenfield (sorry, couldn't resist) and have never seen his art...nor 5th, 10th, or 50th generation derivatives of same.
The world has changed a whole lot in 50 years.