I found a Tevinter magister mildly interesting when I thought Dorian might be an elf. But I already know about Tevinter magisters from Fenris, so if a regular human one decided enough is enough, and is just going to come and tell me all about how crazy Tavinter is, well, I've already had that? And please, no more blood mages. It was bad enough that Hawke HAD to befriend Merrill, whether s/he wanted to or not (she always shows up at the final battle, whether you do any of her quests or not). Now yes, I do have some Hawke's who loved her and accepted her, but I had some who were 100% against blood magic (even if they were pro-mage freedom) and wanted nothing to do with her cute little self. I just don't need to see another blood mage, and Dorian being a boring old human magister is, well, boring to me.
Vivienne is, aside from her personality and her look (which is AWESOME), sooo YAWN. Another pro-Circle mage? Again, we've seen that.. And Solas, the apostate. Well, we know next to nothing about him, so I'm willing to not pass judgment for now
But he better be interesting. NOT Dalish, please; we've already had two Dalish mages before! If he's some crazy throwback from a by-gone era, OR if he's the replacement for Dorian, and a runaway Tevinter magister, then I'm curious.
EDIT: This is saying nothing against the writers, and I'm sure these will all be great characters. This is just my random personal rant against mage characters
I often try to play without any mages at all in my party.