ABC Sport quoted England's big-hitting middle-order batsman as saying, "I think he does get treated far too harshly for what he deserves. He's the best player that's ever played the game."
Warne has taken a lot of flack lately. The spin-wizard, who took 40 wickets in the Ashes series, is in the middle of quite a separation saga with his wife. Fame seemingly has its price.
Pietersen was referring to the attention the tabloid press has paid to Warne's often tumultuous private life. Warne separated from his wife earlier this year after tabloids reported on his alleged indiscretions.
"It is ridiculous because you can't defend yourself and that's the thing. Much of the rubbish that's written about you, there's nothing you can do about it," added Pietersen.