I have finally watched a full game of Rugby and I have to admit..... Answered
even though I don't normally sit down and watch "sports" of any kind (unless I am trying to pick up some pointers, like watching snooker, chess, or other tournaments), that compared to football in the USA, or baseball, the action was definitely more engaging.
I mean, they actually moved around on the field, and for longer periods of time then 2-3 seconds. Our football is comprised of 1-3 seconds of movement followed by nearly 30 seconds or more of wondering about until the next play.
Rugby to American football is like a cheetah is to a snail. If I am going to watch one of them, I will watch the cheetah :-)