I have a question similar to this one.
The Big Bang Theory episode "The Opening Night Excitation" deals with the opening night of The Force Awakens.
In the episode, the Force Awakens is shown to be really well-received. The four big Star War fans love it, the non-science fiction fan "liked it, ok" and the hardcore Star Trek fan likes it more than he thought he would.
However, the episode was released December 17, 2015, meaning it was written and filmed way before the film's reception would have been known.
They couldn't just assume it would be good, because then they would seriously embarrass themselves if it wasn't.
Have any of the creators talked about how they knew most people would like it?