There was a Q&A done with Brandel Chamblee on golf.com. One of the subjects was a flaw in Tiger's swing with his driver.

Part 1

Part 2

And then Rick Grayson (A top 100 teacher) chimed in

Rick Grayson Comments

I think the stats are intersting. Anybody else have any thoughts?

A pretty swing is not all that important. Arnold Palmer has one of the worst asthetically. Jim Furik has been described as an octopus falling out of a tree. I've had two holes in one and eight two's on par fours and if you saw my swing you'd laugh.

M2D, I agree that a pretty swing is not necessary, but if you take a look at the stats they talk about, you can see that Tiger has an issue with his driver. He's hitting less than 50% of his fairways when he hits driver.