Huh. I was just watching a review for No Man's Sky that made virtually the same point, down to the 50 hours. The review said that the first couple hours were very boring, but once the intro and early game was out of the way, it got way more interesting. His pinned comment reads "I have now sunk in 50+ hours into this game. It keeps showing new stuff. Please help me. My family hasn't seen me in days. "

Maybe open-world game developers need to see if they can streamline the intros somehow. Even if the intro isn't a large percentage of the time you play the game, it does make the first impression.