Really fun movie, and Stewart was great.
This isn't the movie you want if you want something deep or thought provoking, but it's definitely entertaining. Eisenberg was good as the dull witted but highly trained killer. It would have been nice to see Britton in a bit more. The highlight was Stewart though. So much for the naysayers who say she can't act. She was spot on in every scene.
For what they were trying to accomplish, it was pretty good, so I would give it an 8/10. I wouldn't mind seeing a sequel.
I forgot to mention, having Walton Goggins as the crazy asset was amazing. Since he didn't die, they should make a sequel and bring him back as Mike's partner.