I am still playing. I finally made it to 60 a little while ago, and I'm now so sick and tired of Hellfire that I can't be bothered to level any further. You get that, when you go out there at 56 (not a typo) and grind your way to 58, and then start questing.
There is one thing I like about Hellfire though: watching people get squashed by the Fel Reaver is always amusing. Especially when a 64 druid actually gives healing himself a go. Hreh. Unsuccessfully, of course.