This is kind of a Brian Cronin question, and I don't mean that as a diss. And I'm assuming here that cartooning and drawing comics are two different things. Cartooning to me is a style of comics-drawing in which the artist is intentionally unrealistic (in anatomy, physics, etc.) in order to better express emotion, character, movement, etc.
Are there any contemporary Marvel/DC artists who you would consider good cartoonists? I mean besides Darwyn Cooke, whose background in animation pretty much guarantees his proficiency as a cartoonist. And Jeff Smith obviously is a great cartoonist, if you consider him a DC guy (I don't). There are plenty of artists considered "cartoony"--Ramos, Bachalo, McGuiness, Madureira, Brooks, etc., etc. But none of them are really cartoonists--they distort reality more for style than expression. In other words, it's cartooning without meaning or substance. If everyone has big bubble muscles, is it really carooning? Or is it just a stylistic choice?
Another question: how many SA superhero artists were good cartoonists, anyway? I can think of plenty of good GA superhero cartoonists, but Silver Age artists aren't renowned as great cartoonists--most of them were too realistic (Adams, Smith), polished (Romita, Kane), or stiff (most of the DC artists, some of the Marvel ones). But Jack Kirby clearly meets my definition--his style was often divorced from reality, but only in the service of characterization, action, etc. He's rarely described as "cartoony," but maybe he should be. John Buscema and Steve Ditko weren't averse to cartooning either. Buscema's villains often had exaggerated, gaping mouths, while Ditko's Spider-Man was rubbery and kinetic. Maybe we should create a new term for this style, like "heroic cartooning" or something, in the hope that some aspiring young artists will seek to emulate it.
Just a few thoughts that occurred to me as I was reading Monster, a "mature" and relatively realistic manga which nevertheless features some great cartooning by Naoki Urasawa.
PS: The wikipedia page for "cartoonist" has a picture of Mark Trail artist Jack Elrod. That has to be the work of someone who reads The Comics Curmudgeon.