I really liked Jan this issue. I'm not familiar with classic Jan and I didn't read Mighty Avengers, but she comes over as really fun here, while still very competent. If this is how she was written in Mighty Avengers then I don't see the problem.
It's not how she was written in Mighty. She was a non-factor during Bendis run on Mighty.
X-Poster of the Month: May 2013 The Best There Is At What I Do