The halo universe is pretty big. There are about 20-30+ books that I can recall, a phone game, and 2 RTS games on top of the FPS games we know and love. There is a TV show releasing this or next year. The universe of Halo is one I've grown up with and can't stop waiting for the next piece of lore to come out. There's a lot to enjoy in the Halo universe even if you don't play FPSes. The books themselves are solid though a solid % is just your run-of-the-mill fiction.