As a fan, I have to agree. The game demands ridiculous amounts of the player's imagination, and no movie director can match my experience of it. But the same could be said about books, and many books were turned into films, and many bookfans were outraged about it. But at least, they had a movie for comparison, and they could say "I would've done it diferently", and by thinking how, the reasons why they were fans became a lot more clear.
So, it's always worth it, in my opinion.