That would make Orsino an apostate... and many of the "Circle" mages as well... interesting thought. Although, in that case, one can be both an apostate and a Circle mage, since they are officially a part of the Circle and breaking rules does not mean one is no longer a Circle mage. If that was the case, then Anders was an apostate, since he kept trying to run off. Wilhelm is still an official Circle mage, skirting Chantry law ya, but still a registered mage that the Circle knew of (not everyone in the Circle, of course)
Still, I find Viv's view of the Circle to be more credible than Fiona's. Viv came from merchant parents, grew up in the Circle, went through it all from bottom to top, she has even seen life outside the Circle and has been involved with the Circle (not just her own Circle tower, the whole system) her whole life, unlike Fiona who just pops in and decides to stir things up after living with death seeking militant fanatics for years.
Seeing that the Circle is not a military must have really shocked her, which would explain her willing to go into indentured servitude for ten years to a foreign power... likely having to serve in a military that sends soldiers to Seheron every Autumn... so... why was she not planning to rebel against the Tevinters as well? A selfish madwoman she was.
Anders was possessed and even admitted he was going crazy and should die if you rival him. Orsino was eager for more power and knowledge with the blood magic experiments his psycho friend was doing. Uldred went full abomination. All other Circle dissenters are either crazy blood mages or apostates or selfish whiners in the case of the mages that the Inquisition can rescue from Hushed Whispers.
BioWare really needs the Libertarians to have a better representative to show their view. Not that it really matters at this point, mages have more freedom in all the endings and Templars were either given a clean slate or disbanded.