I'm not entirely sure, if people would really be down with assists yapping their mouth off every time they get called. In the long run, i think it's a nice characterization device for Cages, but i don't need to hear quips every 5-10 seconds.
As for Janet herself - great addition (even if i'm still a tad bitter about her not being Johnny, as was originally promised, but i'll live), not a meta-definer because of the difficulty of use, but having a whole roster of puppet-types, thanks to her adds as much new possibilities as Khameleon did.
Edit : that chip has to go down, though. I like her being a jail monster, that's a good reward for seting her up, but 1.3 % per attack is a tad high in my book.