Man, I actually enjoyed the movie and found it to be way funnier than expected. Rob Schneider didn't do much of a job, but I agree with your that the wrong Missy is great. She made me laugh quite a lot, and as I expected this to be a poor movie, I actually enjoyed it way more than expected. Wrote my own positive review here: https://peakd.com/hive-118364/@unbiasedwriter/the-wrong-missy-funnier-than-expected

In other words, this came down to me as a positive experience, and I laughed quite a lot.

Rob Schneider was amusing in Big Stan (movie from 2007). Since then, I cannot say that I have enjoyed his company very much.