Oh and I think I expected him to be a lot more pacifist, based on how he was described pre-release. So when he went after the mages in a rage in his personal quest I was surprised by that too.
Oh god, yes. That scary reaction made me regret romancing Solas. It was turning into the Fenris disaster all over again... sorry to all Fenris fans, but that romance was so awful, it scarred me. I ended up resenting Fenris for his out of control anger that Hawke could not reason with.
It was actually quite funny at work, my colleague kept teasing me even before release that Solas would end up the Anders of Inquisition and fu*k everything up just as I predicted. Just because I decided to romance him, and that made him tainted by default to my colleague, lol? And we were both right....
He kept making fun of me for weeks and enjoyed my agony while he was happily pursuing the Sera romance. Not jealous about Sera at all, but... damn, I know how to pick 'em.
I TOTALLY walked into that pre-release info trap. AND his introduction and awesome fade conversation at Haven. I thought, ok, it's all good, he's NOT a passive-aggressive elf/mage. He was so polite, even quite cheerful. And seemed rather open-minded and tolerant. Of course I knew in my heart that he was responsible for the breach but I kept hoping he'd have a pleasant personality at least... And maybe there'd be a less Anders-crazy reason for the breach since he was rather romantic about the whole thing. Well, I DID end up forgiving him. But boy, he's got a nasty side!
His arrogance REALLY put me off. In that respect he's not unlike Vivienne... Dorian's arrogance is all a mask, he's all soft and sweet inside. His hyperbole masks his insecurities and sadness. Solas on the other hand displays real arrogance and he's cold as ice when he disapproves. Very condescending. I was shocked at times. He's got a temper too. I felt so unpleasantly reminded of Fenris, the romance was not an enjoyable experience for me until it was actually over. Then I felt deeply sorry for our poor Dread Wolf.
Still... it's kind of weird, but also fascinating. Solas has this air of ancient wisdom. He's a god or something similar to it, he's been around for ages. He's mostly composed and pensive. His voice is very soothing. He seems very mature at first glance, it fits a powerful ancient creature. At the same time he seems so very YOUNG at heart. Especially in the last scene with Mythal where he reminds me of a lost child who needs comfort. Solas embodies so many traits I would associate with a teenager. First of all, rebellious! He is idealistic but short-sighted. He's almost naive in his inability to see how his plans could go wrong. He has a passionate impulsive side that interferes with his plans. He does not have the kind of mature self-control that he thinks he has. Which shows in the romance that he succumbs to despite his initial protest. He plays it all cool in the beginning, flirts with ease and is not shy about it at all, thinks he's got it under control, but then the whole thing runs away with him and he gets the both burned. He's much like DAO Morrigan who set out to trick the warden into the ritual but then fell in love. So the tease that Solas and her should get a room is quite apt. They are sooo much alike, both rebels and Mythal's children in a way. Almost like twins in spirit. They both look so stupid at the end. They can't see the big picture, can't see it's not as simple as they make it out to be. They just want something good but don't know how to actually make it happen. They plot their own thing but it all goes horribly wrong. I used to think Morrigan was so wise for her age, and she does understand so much about what's going on with the elven gods. But they both get played masterfully in DAI. Mythal is much more the staple mysterious all-knowing goddess who pulls all the strings. Solas is really really young in spirit...
All the gloom and doom emo stuff is part of his teenage heart. "I am so misunderstood, so lonely, I hate myself..." This could be out of any teenager's diary *g* Solas has a LOT of growing up still to do if he wants to restore Thedas.
But now I understand why everybody is so in love with that character: a wolf god of ancient wisdom with the wounded heart of a small child and the passion and idealism of a teenager. 
He's got that mentor sex appeal AND he activates women's mother/healer complex. Oh boy, Bioware created the perfect trap! 
(This has all been discussed before I'm sure. Sorry I'm late for the party, took me over a month to finish the game, real life is a b*tch.)