Firstly, he had the fastest car when he won his titles. All he had to do was keep the thing on the road.
Tiger Woods? Look I'm a teaching pro, and untill he's passed Jack Nicklaus in the amount of majors won, he aint the best ever in my mind. Respect like that has to be earnt. He's nearly there, fair enough, but untill he's done what he's set out to do, he's still found wanting. Plus a better Ryder Cup record wouldnt go amiss either!
I'm not too sure who i'd pick, but it does seem to me that people are picking people from this decade when there are plenty from before the 90's 00's who've put their respective sports on the map, made their sports what they are today.
Arnold Palmer did this for golf, Steve Davis for snooker, Jackie Stewart for F1, There are loads to choose from. its not all about who's the obvious choice here. The people who made the sport what it is today should be recognised.