The problem with this movie exists at the very deepest level of plot: if these characters are brother & sister, they can’t wind up together and all their great chemistry is to no effect.
So while there were things I liked and some nice performances, it’s ultimately not what the viewer of a romance really wants to see. And the romance that does feature as a B-plot was shown so minutely in the film that you never really get to root for it.
I don’t think I know a single other person who saw this. It was crazy hot that day, and I can’t afford to turn on my air conditioning, and it was the only movie starting within the next 30 minutes. Also: Chris Pine is yummy.