Were Magister to be cleaned up some, then yes, it'd be a strong contender to take as the primary, especially if it added in school-based flavor rather than straightforward boosts.
As is, I'm still getting the same impression as before. There are no toons I'd want to build for Magister as a primary at the moment: Again, due to the emphasis on anti-magic abilities that have no real direct benefit to the Magister, as well as underwhelming abilities such as the summoning+ [which could be fixed simply by adding a second tier], the weak summons, and the single-focus, twisting-preferred nature of the sigils.
Magister simply isn't polished enough yet to be of interest, but it has all the potential to get there easily.