I mean...yes? ^^; I don't think anyone needs to be told that the art of a comic matters, especially not here.
If anything, I think what people need to realize is that VISUAL STORYTELLING, as a specific subset of the art quality, does indeed matter.
Usually when amateurs want to improve the art of their comics, they're way too focused on how 'pretty' the people look. Making sure they look like they're actually moving or reacting appropriately to what's going on comes much later, if ever. =/
More than once, I've been tricked by a comic artist who's actually really good at drawing people standing around talking in 3/4 views, but once they need to use a slightly different camera angle or just a little bit of action/expression, all of a sudden their 'good art' falls apart and it's like "wow...they actually don't know what they're doing".
And it's sad to me, because it shows that they were never taught what truly makes a comic work beyond 'a series of cute pictures'. Expressions and movements should be fundamentals to comic drawing, not 'optional' extras.
But what's even sadder is that it's easy to get away with treating those skills that way: I've seen plenty of Premium/promoted webcomics where the character drawings are kinda weak. :[ Not flat-out BAD, but flawed enough that it's easy to tell what the artist's weaknesses are. But if your anime boys and girls are pretty-looking enough, apparently it doesn't matter...
Anyway, in general, I think the vast majority of amateurs (even the more advanced) struggle with gesture drawing and making various types of panels look good and understandable, rather than just the "easy" ones. And I wish there was more in-depth discussion about these things, if only on this forum. Pretty much the only people who ever ask about movement are people who want to draw fight scenes, and action comics are a minority around here, so that's almost no one.