Since 1939, the Boston Red Sox have had an almost unbroken chain of good to great left fielders. Almost seventy years of excellence, beginning with Williams, followed by Yaz, Rice, and today by Ramirez.
Chronologically Greenwell falls between Rice and Ramirez, and while he is probably the least of the five, he was very good. An above average hitter, with sometimes surprising power, he was solid defensively.