Would I read a comic where the art wasn't perfect? Yes. I read and enjoy a bunch of scratchy-looking autobio comics and comics with more childish-looking art, because that art style does suit the story they are telling. You don't always need super-polished art to make a good comic. As long as I can tell what's going on, we're good!
Take XKCD for example. It is literally stick figures, and I still read and enjoy it, because it's funny, it tells interesting stories, and I learn stuff from reading it.
But a comic with decent art and terrible writing? I would nope right out of there. Comics are storytelling. You can have the art-chops of Rembrandt, but if you can't tell a story, you won't make a good comic.
I'm not saying you have to be the most brilliant writer in the world to get me to stick around, but I won't put up with stuff that is outright bad. Terrible pacing, poorly planned plots, inconsistent characters, stories that go nowhere, reliance on worn-out clichés without ever doing anything creative with them, etc.
I think my favourite bad translation was in a shoujo manga where, in the middle of a heartfelt romantic monologue, the heroine goes "and my umbrella does hula hula on the spot". There were no umbrellas in the story.