The irony of movie criticism is that the most capable critics, who have seen thousands of movies, and know vast amounts of trivia about them, rarely agree with most of the public.
However, some teenager who knows very little about the movies, but knows what he likes, and what his peers like, will be a lot more popular.
As far as Ebert goes, the great big glob of tar that stuck to him was that he wrote the screenplay of the awful, dreck movie, called “Beyond the Valley of the Dolls” (1970). It guaranteed that if he truly panned a movie, those involved could point to Ebert’s failure as proof that anything they did couldn’t have been that bad.
Would you make the same argument with what medicine to take? Why ask a specialist...ask someone who knows what medicine their peers will like...
Well Ebert just loooooved the motorcycle diaries which was a fond reminisce about the youthful experiences of that murderous bastard Che’ Guevera.