So here I go resurrecting a dead thread, but only because I'd like to chime in on a particular photographer.
Nobuyoshi Araki
I am, one could say, a devotee of his work. I love it, and have since I first encountered it in a used book store at age 14. I have spent countless hours exploring his work, interviews with him, commentary on his work, essays he's written, etc. I will be the first to admit that his work is not necessarily the most accessible photography in the world, but if you get it, and you like it, it is wonderful.
He is equally consumed by his love of photographs, his love of living, and his love of women. The way he works is frenetic. To me, his work is best considered en masse. Don't just look at an image or two, immerse yourself in a book or (preferably) a stack of his books. There's plenty to choose from - I believe he's published around 400 of them now.
There is a richness and an energy to his work that I love. It's not remotely all nudes, either. Hell, that's just one facet of his work. Look at his flowers, city shots, cloud shots, portraits, fashion, etc etc etc. I see in his work the reflection of a man who is fundamentally introverted and extremely sensitive, and who has created an exuberant persona of sorts through which he creates his images. It's almost like the only way he knows to fully express the way he feels about life is through his photographs. That said, his essays are excellent too.
Anyway, as for someone whose work I don't get (or like) at all, top on the list is probably Nan Goldin. Yes, I realize she did a book with Araki, but it is among those photography books that I choose not to own.