Before my Miraviglia cruise last October there were discussions here and on FB about a certain ethnic group that was being obnoxious, cutting lines, reserving seats in theater, etc. I found it wasn't too bad on my cruise.
The ceiling and stairs get old pretty fast. The only quiet place to sit was in the piano bar on deck 17. The MDR food wasn't too good. I did not like a set dining time either.
But the shows were great. Also enjoyed the after hours pizza and snacks.