Lampard is a playmaker now? What the hell? Next, I'll hear that Roy Keane was the world's best playmaker...
There is a difference between a central midfielder, and a playmaker. A playmaker, generally, is one like Zidane or Riquelme. Not a natural goalscorer or a defensive presence, but has the ability to create attacks, make good passes and set up goalscoring oppurtunities.
Players like Lampard and Ballack are good enough at defending that they aren't singleminded. This doesn't detract from their ability, but because they are not focused almost entirely on offensive play, they are not playmakers.
Nedved is a different story altogether. He's not a playmaker, because he doesn't act as a link between midfield and attack. It's hard to say what he is, but I think that "horizontal winger", makes the most sense.