I honestly really enjoyed the movie (saw it a couple days ago). Something I noticed is that they made it very comic book- like. There's nothing wrong with that, it's just that since they used slow motion a lot for her fighting scenes it almost seemed over the top. The only other thing, besides the ending as said, that bothered me was the way she held her arms sometimes. That sounds rude but it seemed a little forced, with them way back so that her chest was more forward. Made me feel awkward watching it.
Overall I really liked it, and it nicely sets up JL. Was also nice to see how they changed it from the animated version - I liked the small changes and additions they made.