Only Magneto is a fair complaint. That was a misstep.
As for the Talia of today, this is the way to make her an effective villain. Writers don't like to take the nature of a villain to the true conclusion, but Morrison does. Magneto is very sympathetic, but he's a would-be fascist, and just because he's changed his ways many times over the years doesn't change the fact that he views humans as being sub-mutant and would destroy the humans if he thought it'd do any good for mutants. I don't know if Talia is enough like her father to take it this far, but this is better than being the wishy-washy mafia princess that she was before.