Thor Rand Al wrote...
N btw when you have a conversation with Alistair n he asks your opinion of the other companions, thats Alistairs way of putting out testers so to speak on how his opinion of the other companions are... if you praise Sten so does Alistair, if you downgrade Zev n Morrigan so does Alistair... Whats interestin is he never asks about how you feel about Wynne n I think Shales not mentioned either when he asks you... You can already see that he respects Wynne so he doesn't need or want your approval/disapproval but the other companions he's looking at how you view them.
Hmm...I don't know if I see it like this.
He will argue with you about the characters, so he has his own opinions. He doesn't change them simply because you think differently, but he's willing to consider other options. Like for Zevran. If you say you're willing to give him a chance, Alistair will go along with you, but say he'll be watching the assassin closely. In the discussion about Morrigan, you might not get any actual disapproval if you say you like her, but it's obvious he doesn't agree. If you say Leliana is crazy, he'll flat out say he wouldn't be so quick to dismiss her claims. Etc.
I think he honestly wants to know what you think, and he's not discounting your opinion outright if it differs from his own. It's a mature approach, I think.