On Warne today, this is a perfect example of why you can't judge players solely on their statistical records.
In the match, Warne took 5 for 216 from 85 overs, which is around his normal rate of wicket taking, but with an average of 43 and a strike rate over 100. That makes it a pretty poor match by his standards. Only his economy rate was lower than his career record.
Nevertheless, Warne was one of the best players in the game. He played a crucial role in the first innings keeping the runs down on a flat wicket, though overall he didn't bowl particularly well and got the worst figures of his whole career. His 4/49 in the second innings is a good set of figures, but doesn't tell the story of his impact at all. Without Warne, Australia wouldn't even have gotten close to winning the match. He only took the two top order wickets, but bowling non-stop from one end for the whole day and the pressure he exerted had a huge impact on England's negative style of play which eventually stopped them from setting a reasonable target and saving the game. When Warne's career is long over and people are writing about his achievements in the game, there's no doubt today's performance will be mentioned as an example of his brilliance, and the fact that his test average is higher than it was before the match doesn't have any bearing on that.
He took the first two wickets to fall to a bowler on the day, including the top scorer and the best batsman in the team, and his pressure caused a run-out, which Warne himself finished off with a direct hit from close range after Clarke's wayward throw. After lunch he came back and picked up two more wickets when the tail looked set to keep Australia in the field for long enough to earn the draw. To put it simply, 5/216 doesn't tell the full story of his impact, just like you'll see plenty of games where a player will take a sizable bag of wickets because nobody else is capable of taking them and have basically no impact on the outcome of the match. Both Warne and Murali have done this from time to time.
Mind you, I'm not suggesting Murali wouldn't be capable of any of the things Warne did today (though I do rate Warne's presence on the field and his ability to exert pressure higher), but it's things like this which make saying "X player has an average 2 runs better than Y player, therefore he is inarguably the superior player" pretty stupid, IMO.