Murphy had a really good run of a few years, and then he quickly fell off to be an average (or worse) MLBer due to knee issues. He contributed 45.4 WAR in a 9 season stretch. And despite playing in parts of at least 18 seasons, he finished with 46.5 WAR total. That means for the rest of his time, he was, essentially, a replacement value player.
Rolen had 70.1 career WAR, playing in 142 fewer games than Murphy (and his 46.5 career WAR). Rolen's best 9-year stretch saw him post 46.3 WAR in that time, better than Murphy's best 9-year stretch. Rolen also posted the single best season between the 2 players, with a 9.2 WAR season (Murphy's best was a 6.6, and Rolen beat that one other year, as well). Rolen was also still generally pretty darned good outside of his "peak."
Would Murphy have continued on and been better than Rolen had his knees held up? Perhaps. But, as is, Rolen was clearly the better player.
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