Well... I have neither seen nor read the Godfather. Yeah, I know, but I really hate the whole theme of the mafia and saw enough of it in other venues not to want to bother with this one.
I've seen but not read Planet of the Apes. I can maybe believe this one, because, well, it's Heston.
Both 300 and Watchmen were so bad, as movies, that I couldn't finish watching them. I gave up on both before they were halfway through. So I find it hard to believe these were BETTER than the source material, though I've never read either of those, either.
In any event, Longmire, for sure, is an outstanding TV series (I'd give it a solid 8.5 out of 10 this season, and 9/10 the first two), but the books are even better (hard as that is to believe). Perhaps because I love Vic and Henry and as good as they are on the show, they are much more enjoyable in the books.
Everything you just said is Insanity. Now Watchmen was a horrible film, not that great a book either so you're not wrong on that. The Godfather is not only a fantastic book but easily one of the best films of all time and the second one is even better. 300 is an amazing film.