Comics are a visual medium, so it goes without saying an artist is important. But not everyone can be a George Perez or a John Byrne, even if they're really good in their own right. Here is where we appreciate those who need appreciation more. Also, include art!
I'll start:
Ron Frenz
A part of the Marvel stable in the '80s, he's the most frequent collaborator of the fan-favorite writer Tom DeFalco. I think his stuff is stellar. He can do environments, consistent character models, and fight scenes really well, especially in capturing the movement of it. I've read Spider-Man comics drawn by him, and he can captured the frenetic nature of an attack. As controversial as the Spider-Man vs. Firelord fight is in certain circles, it really displays the strengths of his artwork and all of what I mentioned.
Anyways, what other underrated artists would you like to mention and display?