I was checking some of these out, like Sonny's and finding them pretty interesting. They used information from the movie as well as the book, including noting contradictions.

Then I clicked on Tom Hagen's and was dismayed to find that wiki considers The Godfather Returns and The Godfather's Revenge to be canon, just like the original novel and the movies. I'm not sure why this has irked me so much but it has.

Does anyone here share wiki's stance on canon and wish to discuss their reasoning? I try to pretend they never existed (as I do often with III, but that is another discussion altogether).