The value of experiencing multiple game types is immense for game designers. To be able to know about games across all genres (and even undefined ones) and draw fun elements from them can really lead to great breakthroughs. Just imagine if Call of Duty never took on RPG elements for it's online deathmatches. I am always looking for new types of games, just to see what they do and where the fun comes from. You can look into a genre that bores you and see why other people like it so much and build on that, and maybe take it in another direction. Even bad games have a lot of game design lessons to teach if you're looking for it.