In keeping with the OP (as opposed to some of the rest of the thread), I'll say that I do appreciate the character. He stirs up a great deal of emotion and passion, and that's a good thing. He isn't flat, boring, or two-dimensional, and even if you don't like him, you can kind of get his motivations (if you've read "The Stolen Throne" you get him even more).
That said, I really can't stand him, and it's for an extremely personal and biased reason: he reminds me too much of my father. He never apologises (well, sort of, but it always comes across as a notpology, IMHO), will only admit he was wrong if there's absolutely no way out of it, he's always convinced he was right and even when it's shown that he probably wasn't, he has a million reasons and justifications for why, okay, maybe he wasn't right, but he still wasn't wrong, he's arrogant, and I could go on but I won't. (Am I talking about Loghain or my father? Hard to say. People who don't have my father issues might not interpret the character the way I do. I know some people totally love Loghain. Not many people seem to like my father, though.)
Note again that I am extremely biased in this, and I know it. My father and I have bad blood, and I have been in a state of no contact with my father for more than twenty years. Loghain reminding me of my father is because the character IS believable. If he weren't, I wouldn't be so bothered by him.
Hence my appreciation, but, at the same time, great dislike. The guy really creeps me out and ticks me off, so I never recruit him (did it once to get the achievement and to see what he was really about, took him to Ostagar, etc., so that's how I know he constantly triggers my father issues).
Rendon Howe, on the other hand, doesn't bother me. Oh, yes, from a story perspective he does because he's vile and evil, but he's pretty much only that. He doesn't have a lot of depth or motivation (other than "Bwahaha, I hate the Couslands! Die, Couslands, die! Now I shall be ultra powerful, bwahahaha!). I love, love, love Tim Curry, and think he does a great job with the voice work, but the character is pretty much cookie-cutter, bog-standard, and not very interesting. There was some indication that he was badly affected by his part in the Battle of White River (Bryland notes this in the Gnawed Noble), but that never really comes across, especially, and he's so vile that practically nobody would care that much even if it was pointed out more obviously.
Basically, I appreciate (but may not "like") any character that has enough realness to make me feel something about them, as I might if they were an actual person. I don't like Loghain, but that's why I appreciate him as a character.
And, face it, without Loghain, there wouldn't be much of a game. "Oh, sure, two remaining Grey Wardens, we'd love to help you, because there's a Blight coming! Let's just get these Orlesian Wardens and troops in, and everyone else will help however they can!" Game would be over in less time than I spend in the character creator!
