I admit, it's hyperbole, but it's not nuts. Between the three you mentioned, two engage in a raw athletic endeavors. The other one plays a game.
Think about it. One plays baseball. One plays football. I play video games. Soccer, hockey, volleyball, it's all the same. The goal of the activity as either a participant or spectator is entertainment.
I find this to be true of any of the ball 'sports.' Those are games first, athletic activities second. I can't take them seriously. These are children's games that adults play for money.
Yeah, I lost the thread on that one.
No.
Team sports are a test of your athleticism on several disciplines, ability to work with others, and in football, rugby and hockey, putting your body on the line for the good of the team and not for your own personal gain. Yes these sports started as games, and are still practiced for recreation, but look at the way these people test their bodies and mind to the limit. Usain Bolt is the fastest man, but he isn't being tested on several disciplines. Just one thing. Wide Receivers in football are tested on their speed, reflexes, ability to catch in high pressure circumstances, footwork for being able to complete a catch (and if against the Steelers, facing a huge Samoan at Strong Safety!). In rugby, Jonah Lomu was 6 foot 5, 250lbs and ran 10.8s 100metres. He helped change the face of Rugby. He was the size of a second row forward, had the power of a forward, but the ability to run as quickly and with as much flair of a much lighter man.
I don't have a lot of experience of American athletes being English and only recently starting to watch Football and Baseball and loosely following Baseball and Hockey since I was a child, but for recent history, my choices for best American (I'll say it as both of the continents), the best American athletes that stick in my mind are:
Pele (I know he's South American, but he was an amazing footballer, he possessed amazing skill and longevity and was probably the greatest footballer to ever live. Maradonna was great, but come on, 1986 ruins it for me).
Tiger Woods - He is just an amazing man with an awesome strength of character.
Michael Jordan - Everyone at my school loved the Chicago Bulls, and we were a school in an affluent part of Essex. Michael Jordan managed to spread Basketball to the imagination of kids all over the world, and that in itself makes him a great for helping to increase the popularity of a sport with its main fanbase and elite operations in North America.
Wayne Gretzky - Watching Ice Hockey as a kid, he just scored goals all the time. For over 17 years at the highest level.
Lance Armstrong - If only for his triumph over cancer.
I'm not too sure who else, but