Love it, or hate it, his life seems to be full of drugs, partying, wild women, cooky behavior and D-R-A-M-A with a capital D. All the ingredients that sells tabloids and give tv personalities something to talk about, all while maintaining a successful acting career.
Like most troubled celebrities who had battles with addictions (Robert Downey, Whitney + Bobby, Britney, Lindsay, DMX, Tom Sizemore, Amy Winehouse etc.), or have had troubled personal lives (Mel Gibson, The Diff'rent Strokes kids, Michael Jackson, R. Kelly, Anna Nicole etc), Sheen is a decent actor in the right material, which must belong in i'ther the action, or comedy genre (no Shakespearian roles).
The Media, naturally, is responsible for the over-exposure of a celebrities dirty laundry as they go out on a limb to get the latest scoop on the celebrity's most recent antics, which includes staking out their home and following them everywhere they go. And when there's nothing interesting left about the (now fallen) star to report, the media moves onto the next target. A good example of this is... noticed after Britney's parents took control of her money how she all of a sudden stopped flipping out (money made her come to her senses) and the media soon eased back and started focusing on that boney Winehouse girl? Whatever happened to her by the way? She disappeared real quick, she shoulda' ate more (lol). From there, they've turned their attention to party girl #2 Lindsay Lohan, at full force. And Miley, your next!
I'm not talking Sheen or non of these other folks up, but people (in general) are usually intrigued by the wild cards in the deck. And the ppl mentioned above are that indeed!