He was fantastic in Game 1, set up the OT winner in Game 2 to take control of the series, and was great in Game 6. More notably, he was better than Kessel in the SCFs, the other CS favourite going into the SCF
With you being an Oilers fan it's understandable that you don't recognize what winning, defensive hockey looks like. That Crosby's line, consisting of a career 3rd liner and an AHL callup who terrible defensively, was able to shut down the Sharks elite #1 line while eating up the minutes of one of the best defenseman in the league was a major factor in that series.
The Pens were a machine that year. There weren't too many games where they were outshototing the other team by 25%.
As a rookie, Murray was very impressive but he wasn't close to an obvious CS win.