Originally Posted by Bathead
Because, simply put, the artwork was absolutely awful, besides being a total rip from a Flash Gordon comic. Iconic, yes, but it's still bad art.
The art looks pretty standard for the time. Sure, you could say it's crude, but it's only crude by modern standards. I'm not sure why you'd say it's a rip from Flash Gordon.
Especially, when Flash Gordon is a ripoff of Buck Rogers.