Since the very first Grand Class Princess ship came out their showroom theaters are the worst design of the major cruise lines.
They have always struggled with the layout and size, and guest are often left disappointed and not able to get in. Often we've found people even sitting on stairways just to see a show.
They did try and mitigate this by moviing some shows that they are able to their Explorer's Lounges, on various nights to repeat them, and allow more people to see them.
However, even on their newer ships they've done nothing about the lousy design.