I absolutely agree, Roy - although my user name should give away my Rondo fandom :p
That being said, our defense is elite against dribble penetration, and Rondo doesn't have many targets to hit on the perimeter. Who mentioned playing Lou instead of Derozan, but that's an even worse matchup for GS considering Wesley's size. There's no way Lou does enough damage on offense against Wesley's stellar D to make up for Wesley's ability to outpower Lou on the offensive end.
Again, GS was my favorite matchup coming into the West playoffs. They play into all our strengths on defense, and it's way too simplistic to simply say GS wins just because of Rondo. I'm one of his biggest fan but geez... As much as I love the dude, I have no idea how he can single-handedly push GS over LA considering the context.