That good old Handegg comment never stops being funny (you are aware that it was named for the size, right?). And BTW there is some kicking as well
1. You are aware that the US is one of those very few countries who for some reason feels that the imperial system is the right one, right? That's not so much about the sport. Sure it would be nice if they went by meters, but as it is, it would be just as stupid if commentators felt like saying that they run 4,72 meters.
2. Boring? Well, that's a matter of taste, so fair enough.
3. Being a former handball player (not any high level) I would say that this comparison doesn't really work that well. It's an entirely different thing and there are some absolutely magnificent catches that I don't see a handball player making (well, maybe with some training they could, but it's an entirely different thing to catch a football at the speed and distance, very often after an all-out sprint).
4. A general thing about American sports. It has its pros and cons, but once again. That's USA, not the sport.
5. They are the best team in the world. It is in general a pretty secondary sport on a world basis (though the growing NFL fan base also means more teams and players worldwide).
It's always a matter of taste. No doubt it's made a whole lot bigger than it actually is (nowhere near the biggest annual sporting event worldwide), but it matters to a lot in USA and more and more people (I believe) around the globe.