Not true, a player should be able to rpg a flashy guy like Dorian or a seasoned warrior like Cassandra if they like, it's just that other opinions should be there in case a player doesn't want to rpg that character type. You don't have to remove all personality from the PC. That's the Quizzy's entire problem. As someone pointed out, they do sound like Tranquils.
That would have been awesome. Dealing with the Seekers on a more personal level, like watching your old squad fall or something, would have been great to experience. To be a believer and then have to truly question it and confront everything you knew and deciding if you will make it better or continue the deceit... If I could have played the male version of Cass (basically Male Shepard) I would have rolled a Warrior in a heartbeat. 
If I had to choose a companion I would have enjoyed playing. It would have been Dorian. Starting out leaving home due to a spat with his father, realizing that your former friends are becoming cultists to a being that is everything wrong with your country, wanting to do anything to stop the eventual plummet your beloved country is facing, and confronting Cory who believes you somehow owe him your loyalty. Oh man.
Yeah, the game could have started with the seekers falling apart and Cass hitting an all time low. Then something like the herald could have happened that gives her new hope. They would have needed to rewrite that of course. Would be weird to have the herald be a companion. So maybe they just found a way to close the breach without it being tied to a specific person. I mean, don't get me wrong, Cassandra's story is woven skillfully into the herald narrative. But they could have pulled it off with Cassandra as the protagonist.
Of course this would have meant playing a pretty predefined character. Like the Witcher maybe with dialogue choices that are within the framework of that character. I would have much preferred that to the soulless IQ. But I get people who want to have their own character to roleplay.
Dorian would be awesome for DA4. DAI is too early. It makes a lot more sense to me to focus on Tevinter in the next game, now that we have such a strong connection between the imperium and the elves.
I'd be all for Dorian then

For real.
I romanced Solas (big mistake; he's so awkward, the whole romance is weird) and the whole "you change everything! 8D" bit was so unbelievable it made me laugh. I don't think that was the intended effect. How the hell does this hundreds year-old demigod fall for Lavellan when she's slightly more personable than cardboard?
Hahaha, I'm so with you on this. In retrospect I like the Solas romance. But until the final romance scene I found it so clumsily written I laughed too during the fade scene. There was so little build-up that it felt totally silly that Solas would be so in awe. It certainly doesn't help that the inquisitor is so boring and unimpressive in how she carries herself. She is neither particularly smart or wise (quite ignorant actually, especially about the Dalish) nor authorative. They have a total mentor thing going where he is the sexy smart one. I don't consider them equals at all.
I know, right? And oh my god, he did it twice. "Such wisdom, much impressive, wow". And all I wanted to say that I was a nobody but this dork gets grumpy and dissaproves. Solaaas, what's wrong with you. You shouldn't be so impressed with a random human who managed just not to f*ck up things at best.
And there's also Cass. She dissaproves when I breath and yet I'm amazing and inspiring. Ugh, these people.

Yeah, when you have to explain a character's feelings by having them declare them like this, it usually means it's bad writing... it should be obvious without words. Like Shepard. Of course Kaidan would be into my Shepard, she's friggin awesome! I mean, they all had the hero worship going but at least for good reason.
The whole time I thought my quizzy was just there. She just listened to other people tell her smart things and give good advice, and then she'd just go along with one of their ideas. Shepard did things her way and told others what to do. The inquisitor is everyone's puppet to me who is the face of the Inquisition but not the brains at all.