Probably Warcraft or Starcraft. Playing is great, but watching is so boring!
Racing games like Forza, Gran Turismo, ect.
What?! I can't hear you over all this awsome! - Pyrrhon (Kid Icarus:Uprising)
Final Ultimate Legendary Earth Power Super Max Justice Future Miracle Dream Beautiful Galaxy Big Bang Little Bang Sunrise Starlight Infinite Fabulous Totally Final Wonderful Arrow...FIRE! - Wonder-Red (The Wonderful101)
Total War Series - Probably the greatest games that you can play. The hours just seem to fly by playing. Can't believe the amount of times I've started after school, finished my hw, and looked at my clock and it was into the early hours.
Yet to watch someone play...
The battles though would be fine to watch, but still boring