I wasnt thrilled with the app at first, but now that I have it; I find myself watching the app more than my tv sometimes. My only recommendation at this time would be to implement the same feature that the cable box has where when you are watching a series that it asks you to play the next show. That feature is great when tv watchers are binge watching.
Yolanbr5 about Xfinity Stream, v4.2.1