When Americans watch baseball, football, or basketball on TV they watch the very best level of baseball, football and basketball there is to watch anywhere in the world. When it comes to soccer however, when Americans happen to catch a game it usually isn't the best. you probably are watching some MLS highlights on ESPN and to tell you the truth that doesnt cut it.
If you however, watched the USA vs Brazil final of the confederations cup last year you will know what I am talking about. there were plenty of exciting moments in that game. If you are going to watch the World Cup, try to at least catch the big games, like the Brazil games, the Germany games, Spain has an awesome team this year. As the tournament winds down to the round of 16, and the the quarter finals, you will begin to watch the best soccer there is to watch. if you still think it's boring, then soccer really isnt for you.
But if you are going to compare soccer to baseball or basketball, at least try to watch the top level soccer games. Still I agree that soccer overall has less exciting moments for the neutral sports fan. I you grew up with it though, there's nothing like it.