In both DAO and DAI I pretty much like everyone. Some, like Oghren and Blackwall, aren't very interesting, but I wouldn't go so far as to say I dislike them. And I actively adore most characters that people have raged about in this thread.
DA2, though... well, even there it's a little complicated, because I really want to like everyone there, too. I like them in theory, the concept of them. It's just that in practice, most of them just became too one-note and unreasonable. The only one who seemed to not actively ignore any fact that didn't fit what they wanted to believe was Varric, who really came across as Kirkwall's token non-douche.
But of course the prize for biggest douche goes to:
Anders. Someone said upthread that Bioware writers seem to read a lot of blogs. I can believe it, because Anders sounds exactly like the most world's mst obnoxious and self-righteous blogger - "oh why won't you see that I'm the most oppressed person in all of history? HAVE YOU NO HEART?!" And like any such person, his natural enemies aren't actually the ones oppressing him, it's the majority of people who just want to live their lives and not devote all their time to fighting against one particular injustice in a world that's full of injustices. "I have removed all possibility of compromise, for there is no compromise," he sanctimoniously proclaims at the end. He's achieved the ultimate goal of of the activist blowhard: he's bullied everyone into assuming either the role of Ally or the role of Enemy, because those are the only roles he can tolerate.
Now, Fenris is every bit as hateful, don't get me wrong, but I'm inclined to let him off the hook because 1) he's got some serious trauma in his past that has given him some understandable emotional problems, and 2) he seems to be at least partly aware of those problems and be trying to cope with them with what maturity he can muster - to control himself when he can, and to apologise for his outbursts when they get the better of him. He's also, at the end, able to rise above it even if you don't have full Friendship/Rivalry with him and join you in supporting the mages if you point out his double standard.
Anders, by his own admission, does not have any angsty backstory to justify his behaviour. No one's ever actually hurt him, he's just outraged about the fact that they could have. It's all a matter of principle for him, all about how inherently wrong it is that he doesn't get to be free. The fact that most people, people who weren't born with sparkly superpowers, are also not particularly free is apparently lost on him - it's all about him and what people aren't allowed to do to him. Oh, he'll get fired up about injustices to other mages, but only because he takes it personally - when it comes right down to it, he's perfectly willing to throw an entire Circle under the bus if that's what it takes to force moral clarity upon the world.
I'm actually sort of impressed with the writing behind Anders. Everything about his transformation from compassionate idealist to deranged fanatic feels completely true to life. Not only have I seen a ton of people like Anders, but when I was younger I am terribly afraid that I was very much like Anders (though I never blew anything up because of it, and nor, to the best of my knowledge, did those other people). But exactly because of that, everything about him infuriates me.