Anders isn't my problematic fave because he isn't problematic. I think the wider concept of anders being 'wrong' the fandom has is a clear example of how biased the writing has been in the games. It's the same reason why people hate Jowan, or why they think the kinloch hold mages were stupid. There's a clear bias in the writing and framing of it all that guides the player towards feeling negatively.
The majority of answers you can give Jowan in Dao are negative, mocking, or downright insulting. The ones who aren't are just... Neutral. You can be a bit sympathetic to him in the circle origin but by the time you meed him in redcliff most of your dialogue choices are so fucking mean. In my replay I was trying desperately to be nice and sympathetic to him but the best you can do is be neutral and let him go but for every rude dialogue option there is no "you've been through something horrible, I'm sorry" or "you were manipulated, loghain took advantage of your vulnerability, I'm sorry" it's soooooo.
Likewise, I always make sure to speak to every single npc in the mage origins and the One mention of uldred before the broken circle quest is from the one mage who tells you about the different political faction enchanters are in, and it's with absolute disdain. That mage thinks uldred is annoying and it's implied that the other enchanters think so, too. Uldred who was an activist for mage liberation is treated as annoying for being an activist.
Then he turns out to be a blood mage and to have killed the majority of the circle, turning them into abominations. The message is clear: those who seek liberation are wicked. In the first game of the series, thus in the game which introduced the concept of circles at all, their existence is justified by the text. It overtly says: look at all those foolish mages, how dangerous they can be when One of them is wicked. Can you imagine if they were free? Can you imagine those abominations' destruction if they were out in the open?
Something similar happens in the mage origin, with Jowan. Through the whole origin, whilst Jowan is painted as annoying, he's definitely seen as a victim. Up until he uses blood magic, that is. Suddenly, the player is likely supposed to think "oh, so they were right to want to make him tranquil after all". Instead of being a way to show that the circle will often turn innocent mages tranquil, it shows you that greagoir was right to distrust Jowan, because he was indeed a blood mage. Instead of showing you how paranoid those in power are about mages, the writing justifies their fear and hatred.
Bear in mind this is the first game and likely the very first thing that happens to a lot of new players. The game does not expect you to know the intricacies of its lore yet, doesn't expect you to understand that blood magic is actually fucking neutral unless you sacrifice people for it. You might be tempted to argue that it's setting up for that realisation later and for you to feel bad about Jowan later, realizing he was led to blood magic because it was his only solution, because he and all other mages are caged like dogs (except this is ferelden, so the dogs are better treated than them). But then you've got the redcliff fiasco where it's obvious the writers expect you to fucking hate his guts
And while dragon age 2 is more overt in its depiction of mage suffering, it also tries to pass on the idea that kirkwall is a special case, that it's only the gallows that are this bad. That it's just Meredith whose craaazeyyy 🤪 and not just Meredith being a product of a corrupt system. The writers expect you to think of Anders as an unstable extremist, or as his writer puts it, a "bipolar terrorist" (note that ofc there's nothing fucking wrong with being bipolar, but I don't think his writer cares!)
With different writers and the exact same set of events, Anders blowing up the chantry would be easily recognized as a positive, as an act of justice, of rightful rebellion. Instead it's seen as a tragedy, a mistake. Instead Anders is categorized as a villain, morally grey even though Hawke themselves has a higher death toll than he ever will.
It's a lesson, I think. In narrative bias.