Wouldn't a team with zero playoff wins be the worst? You're kind of making yourself look like a complete moron here...
Actually, take out the 'kind of'
The Reds haven't won a playoff game since 1995 so they'd have to be the worst if we're talking about the last decade. What time period could you possibly be referring to that would make the Cubs the worst?
And I also doubt that the Yankees would be the best. But you made a claim so lets see the proof.