The widely considered best rotation of all time is the 98 Braves. Their numbers looked like this: http://i.imgur.com/POBsavy.png Here's what the Cubs, at present, look like: http://i.imgur.com/ehGcOZv.png They're really not all that far off from the consensus best rotation of all time. At the very least, if they keep up their pace, they could easily be considered one of the Top 5, IMO, maybe even Top 3... but we have injured Lackey and 2nd half Hammel making an appearance so who knows what will happen.