Well I hope that Woodley's acting skills and the characterization of MJ are very good because it's going to take quite a lot to prove to the audience at least that her version of MJ is not only good enough to be with Andrew's Peter for the series, but is also not the proverbial rebound/consolation prize after Emma's Gwen Dies.
At the moment, and I'm not really judging this on her appearance, but I really don't see Woodley being able to gather as many fans in liking her character like how Emma was able to for her take on Gwen.
Personally, I think Shailene is attractive, but I do have to admit that I find Emma to be more attractive just from first impression, and I'm not using the pictures above to make my point. Even way before it, I always thought that Emma was more attractive.
So yeah, I really hope that thye make this MJ very likable and not the overbearing LI that Kirstin's MJ was.