I don't see Arthur as some sort of martyr in his workplace who would be promoted and have a bright future if only he weren't surrounded by people who disapprove of his politics. He seems like a fairly mediocre, bumbling kind of guy that you'd have to be stupid to give additional responsibilities to. Anyone can say "oh, I could advance if I wanted to, it's just not important to me." But I don't look at him and see someone under-utilized. I see someone who's quite comfy in his dead-end job and makes excuses for why that ought to be good enough.

In general, I'm sympathetic to people not defining themselves by title or salary or occupation. It's more the combination of that with having seven kids that seems to me like it's making trouble for others.

I mean, there's also underlying, questionable story things like how the only poor family we see in the wizarding world is treated like they wouldn't be poor if they'd just had fewer children. And "poor" in their case means stuff like "can't afford new clothes and economize on their kids' school supplies." But Arthur, in particular, seems like he's just play-acting at being an adult. And defaults to sneaking around his wife because he wants what he wants (his muggle-related hobbies) but he's not mature enough to present them as something he has a right to pursue openly. And yeah, at least some of the time, I can laugh at him. But what I can't do is take such a man seriously.