Yes, it should be, as long as it’s reflective of how many games the team won. A player can absolutely put up a lot of WAR on a shitty team. Look at Cal Ripken in 1991. If he’s not on that team, they don’t win 67 games. They win more like 57. I guarantee you, would bet a lot of money, that he piled up a ton of Win Shares, too.
But if your claim is that the player on a team with 88 wins are collectively more valuable than the player on a team with 98 wins, well, sorry, but they can’t have been. That doesn’t make any sense at all. Your analysis might reasonable conclude that based on their individual stats, they would be expected to probably win more games going forward. I could totally believe that. But if in the past they did not win more games, then that’s an absolute fact that cannot be ignored. Actual value in the past is winning games.
The entire point to sabermetrics is establishing the relationship between what baseball players do on the field and winning games.
You are confusing talent and value. TALENT is the ability to apply skill to accomplish an objective. A player has TALENT before they even step on the field. 50 home runs is evidence of talent, but it is not itself talent, it is a product of talent.
VALUE is the outcome of the application of talent, measured against the accomplishment of objectives. In baseball, value is winning games.
A player who hits 50 home runs for a bad team will still cause his team to win more games than they otherwise would have, even if the team wins few games. A player who hits 50 home runs a year can be expected to continue in the future to help his team win games. No team wins zero games.
James’s point that WS measres value, not talent, isn’t a weasel at all, it’s an honest and totally correct statement, and incredibly important to understand.
Absent some other evidence, no, he is not.