Avoiding the disastrous outings is a pretty important skill. Every pitcher looks amazing if you let them take out a few bad starts. I'm not sure this is true. If you take out outliers on both ends, I think some pitchers will look very different than others with comparable overall stats. That's probably true, but it's subtly different from "He'd be his normal self if not for a few terrible starts." But its critical to the point. If Zambrano gives you 25 above average starts 4 ridiculous amazing and 4 ridiculous bad start, but randy wells gives you 10 above average, 5 average, 10 below average, 3 great, 1 amazing, and 4 ridiculous bad, who is your more valuable pitcher even if their ERAs and other overall numbers are comparable. In 29 games Z has you with a chance to win and with wells its only 18. I know you know this, but the mean and the median are not the same. ETA: All of this is theoretical, and not based on any observance of the stats other than a cursory glance at Wells game log. Insert names James Wilson and Gregory House if anyone has a problem with the above.