Remember that The Road to Los Angeles was Fante's first novel, so it isn't surprising that some would consider it to be a lesser work than the other Bandini novels.
In Cooper's Fante biography he describes how trusted or respected people were pulling Fante in different directions as far as Road to Hollywood is concerned, and how the manuscript was rejected by three publishers (Knopf said it was "unworthy of publication," and rejected it with "particularly great disappointment"). Fante wanted to burn it after the third rejection.
I think Road is very funny, and certainly a precursor to Bukowski's attitude toward, and writing about, work. It's a great beginning to the Bandini saga, but to me, does read like the work of a young or first time novelist. That's one of it's charms though.