Video games I feel like reverse this general trend, though. Unless they have a major story component (and sometimes even if they do) many games get iteratively 'better' (better for the purposes of making sales if not of making original fans happy) for various reasons: improvements to the core game loop, polish that makes the game more appealing to new audiences, and most importantly graphics.

Story-based content is what struggles with sequels because it's really hard to both capture the feeling of the original sufficiently to satisfy existing fans while also telling a new story that's interesting in its own right. Being derivative without being too derivative.