The cliff hanger ending was probably my least favorite thing about this movie, but now that you mention it I also didn't feel much chemistry between Naomi Watts and Frank Grillo either. I liked his scenes with the kid though and he does carry the movie pretty well overall, but there just isn't a whole lot of development for his character.
The action scenes were fun too and well done on a practical level, but if your going into this as a mindless action movie than you will probably get more out of it honestly. I also enjoyed Mel Gibson and Will Sasso in this as the villains, but they could have been given more to do and Michelle Yeoh was such a random, wasted addition to this with her role.
I am completely in love with Selina Lo too.
C+