50. Justin Morneau (Rockies career WAR 3.8)
This has more to do with brevity than talent. He only spent two of his 13 big league years in the purple pinstripes. But what a two years it was, especially in 2014 as part of the best Opening Day lineup in Rockies history.
That year was also the year that Morneau won the National League batting title (his only one), while slashing .319/.364/.496 producing a 125 OPS+ and 3.4 WAR. He’s also the best defensive first-basemen since Todd Helton retired.