We had a great time as spectators at the CrossFit Games, but it depends on the WODs/events. The ones held in stadiums and arenas were great. The organizers really had a way to “game-ify” them and make then into exciting races. Plus there were big screens, announcers, etc. (I wrote about it HERE.)
But I have heard ticket-buying spectators complain about some of the events, especially the surprise events that take place outside of the main facility, like swims, runs, biking, etc. When you buy a ticket ($265 to $665 this year) you expect to see all the major events you can over the four days.
But having been there once and seeing 16,000 people erupt in the final events, I’d say that most of it is pretty viewer friendly. I mean, people watch golf and baseball… 
I admit though, it was weird when the athletes were jumping rope as part of a larger event and 16,000 were cheering them on. Surreal, even.