Ruud Gullit was game, but the best Fan Fest rally speeches need to follow simple rules - be loud, be simple, be brief. The most memorable speech of this kind still belongs to Laker guard Byron Scott, way back in the Showtime Era, after the Lakers had won championships twice in a row.
It's perfectly appropriate, it gives the crowd something to chant, but realistically, can only be used this season by the Houston Dynamo. Anyway, I'm sure Ruud's speeches will get better. David Beckham's was actually worse. He didn't get close enough to the microphone, so no one heard anything he said.