If the goal is to get the best artists actors and filmmakers in the world to create the best movies Hollywood does a decent job. And I think no one would disagree with me that it also makes a ton of bad movies and employs a bunch of hacks.
Music is emotional and you may catch a musician in a very unemotional mood or you may not be in the same frame of mind as the musician. So a critic will often say a musician is slipping.