If I understand the win shares correctly, Pujols has 30 of his team's 228 win shares, or 13%. Lee has 29 of his team's 177 win shares, or 16%. Wouldn't that make him more valuable to his team than Pujols? I don't get win shares as a way of comparing players on different teams. Win Shares is a stat that tells you how many wins a given player has contributed to his team. 3 win shares = 1 win. 1 win share is hardly conclusive evidence, but it indicates that Pujols has contributed one third of a win more than Lee. If you go by percentage of team's win shares, a good player on a bad team will always look best. Bay and Dunn also rate higher than Pujols. Evaluating two players on different teams is simple, the bigger number the better. However, like I said, 1 win share is definitely not a huge margin. How is that evaluation fair, since almost every team has a different number of total win shares? If two players hypothetically performed exactly the same, and were on teams with drastically different records, wouldn't their win shares vary as well? EDIT: Here's an extreme example. Pujols gets traded to an expansion team who's pitching staff consists of 9 year olds. That team wins 12 games all year. Pujols if he is 100% of the team gets 36 win shares, a number that Derrek Lee surpasses if he is on a .500 team. So Pujols could never make an out, and not have as many win shares as Lee will at his current pace.