I have completed almost 70 cruises on all the major cruise lines and rate Oceania very poorly in the entertainment and shore excursion areas.
The ship entertainment is very repetitive and of a low standard. The magician/comedian who was on stage 4 times during our 20 days would have starved if he was a street busker. The music entertainment is based around eastern block musicians who lack any character and generally play music which only 80 years or more old. The entertainment is of the lowest standard and the most boring.
The shore excursions were not monitored by ship staff and left its guests to the mercy of operators who shortened the excursions and drove you mad about tips. Many of the buses were of poor quality and poorly maintained. The excursion staff seemed well trained to be rude, demeaning and specially selected to know absolutely nothing about the destinations,