Pardon me, but is it even possible for a single player to dominate a soccer game on a consistent enough basis to be compared to "Jackie Robinson"? The game is so subtle that it isn't obvious to me who the really good players are without the help of the analysts. So it comes down to opinions, and they can be manipulated for good or ill.
Pele, Ronaldo, Ronaldinho, Diego Maradona, Zinedine Zidane. To name a few.
It won't happen consistently, but certain people can shine during a game so much that you forget anyone else played, and it'll make them beloved worldwide (except America, of course). I'm thinking Ronaldo or Beckham, or even the relatively unknown second-starter Bastian Schweinsteiger who scored all three goals for Germany in the 2006 third-place game (NO, that one was NOT an own goal, screw the refs).
I was watching Top Gear the other day and the presenter asked Mika Hakkinen why Finns are such good drivers (they lead the world in most international racing stats). His response was that driving is practically a national sport, and kids start it competitively as soon as they can see over the steering wheel. You can't start in a sport later in life and be the best at it. Thus we will never be great in soccer until it becomes a sport that a good percentage of American kids dream of playing professionally. For example, Donovan is good, but where he is at Bayern Munich I can think of at least three players who are way better than he is.