I actually see Solas as a wiser, more competent version of Morrigan who has a much better grip on his emotions and far better intuition. 
Morrigan's had a lot of 'Stupid Evil' moments throughout her screentime, as well as intelligent ones. Being raised by a cackling elf god riding shotgun in a cackling apostate troll-grandmaster tends to have that effect. She's rather arrogant about her knowledge of ancient magic and elf language. Solas corrects her and she gets indignant. Solas is contemptuous, but honestly, I would too if I was a god and someone was boasting about how much they knew while getting so much wrong.
Inquisition lets us see one of her biggest mistakes, (Dismissing Mythal as either dead or non-existent, then accidentally binding herself to the one person she was trying to flee.) I loved that Inquisition showed us Morrigan completely screwing up, as well as standing up to Flemeth and having great moments. She's one of my all-time favorite Bioware characters along with Solas.
Solas is definitely the more radical one, though.
I guess a lot of this is just me getting bored of making fun of Solas for being Hawke x10 when it comes to screwing up.
We don't know what he actually did. We just have wonderful theories. It seems like Cole supports him as being right, whatever it was.
Then again, the 'you did it because you had to, not to be right. But you were right,' suggests he was being kind of an arrogant know-it-all about it. 
I kinda see Solas as a much older, more experienced version of Morrigan that was defined by his allegiance with his mother figure Mythal instead of his rebellion. (Ironically.) A version of Morrigan who had to do much darker deeds.
Definitely in agreement about the Solas Leliana parallels. 
I also despise time travel outside of Doctor Who, and even then it can wear on my patience. But it's the best way of looking at real I've seen so far, which worries me.
Then again it will all be worth it if we can travel back in time to mess with the Dread(Locked) Wolf, Mythal, and Solas all at the same time.
We will not speak of time travel again, ok?! I'm totally paranoid about it now. If such a thing is possible, then surely this must be a big thing? They can't just casually introduce it and then forget about it. Really nervous now that you're right... how I hate it when the big "twist" is that it's all a dream, which is the same thing as an alternative future. Or maybe the fade is reality and everyone we know are the spirits. Ugh. I'll just have faith in Bioware... 
Solas has to be wiser by default having been alive that long. He has all the knowledge from experience. But Morrigan is a smart cookie too and she's about the only human in Thedas who has even a inkling about what's going on. I don't know how much Flemeth told her. Of course she looks like a fool compared to Solas when it comes to the elves.
Yeah, the Temple of Mythal was sweet sweet irony. Such a great scene. Morrigan got what she deserved by drinking from the well, I guess. She got it so very wrong. But Solas messed up big time too twice. Of course we do not know exactly what happened yet and can't really tell how stupid it was to give Cory the orb, that is true. He failed to do what he had in mind, though.
Morrigan has an air of innocence about her, I agree. Despite her cunning nature and scathing remarks, there is something soft about her. I can't even say why.
Morrigan and Solas seem to have a lot of parallels between one another. They both have close ties of Flemeth, and the implication from the developer notes is that both of them have been factored into Mythal's long term plan. The sense I get is that Solas is the weapon- the thing Mythal intends to throw at her enemies. Morrigan is the future- the person she intends to carry on her role after it is all over.
Yeah, I see them as Mythal's rebellious children. She has a plan for them both, she's pulling all the strings in the background it seems. How things will develop now that Mythal is in Solas, I have no idea. But I wouldn't be surprised if she plays him too in some way. Morrigan was right to mistrust her. I would not want the gift of godhood. It's not really that different from what she thought initially. The intent is different, but the result would still change her forever, no? Morrigan would become somebody else. Solas might be the blind naive one about Mythal due to the bond they once had... I don't trust a vengeful god at all. Mythal might have been the protective mother of Thedas once, but her betrayal seems to have corrupted her a bit. She seems so wise and calm, but I'm wary. Maybe Morrigan and Solas need to stop her together at the end and then you have to decide which of her children you support to carry on shaping the world, Solas or Morrigan...