Normally I'd say "shut up you stupid biased Yankee fan" to something like that but there's a legit point to be made there.
Granted, I think it's really difficult to compare starters to relievers, especially across different eras. (Mariano vs. the many HOF pitchers before him)
The sad part is I'm less than a month younger than Kershaw. He's making millions of dollars as one of the greatest starting pitchers in the game, and I'm sitting my fat ass on my bed on a random message board talking about how great he is.