A few years ago, I made a series of blog posts trying to answer this exact question. I used career bWAR as my main evaluating tool. However, I also categorized it by the number of players that made the majors and how they did (subjectively). Is just getting many players to the majors make it successful or is it just pure value (bWAR) that is most important. I think that depends on the org (small market vs large market) as a small market needs multiple cheap players, whereas a large market is looking for marquee players more than role players.
Maybe, I will make an update to this to reflect the last few years.
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