Even though Princess Cruises is based in California, the cruise staff and entertainers come primarily from the U.K., a carryover from the P & O days. The headliners are often familiar to Americans but the cruise directors, musicians, dancers, etc. are usually from the U.K..
It sounds like you had a good trip and I'm happy for you.
I'm just not clear on what you mean by "too many British entertainers"; you didn't like their choice of material, or you didn't think they were professional, or you couldn't understand them, or you just thought there should be more diversity? Or you were expecting all-american entertainment?
I'd be interested in hearing your(or anybody elses's)thoughts on this.