Hi,
I loved Thomas Covenant, the first trilogy especially. A long read, emotionally hard in places, but landmark fantasy. Beautiful prose, fantastic imagery and wonderful characters, I think Saltheart Foamfollower has to be one of the best ever created. Donaldson takes the incredible depth that Tolkein brought to the genre and moves it to a whole new level. Having said that he obviously has some sort of dark side / depression.
The second trilogy was much harder to read then the first, the characters become more and more flawed. Then you move on to Mirror and suddenly things get worse. Now your hero no longer has feet of clay but is almost completely clay. Then came the Gap series, and I simply could not read far into the second book. It was simply so dark, the pain and suffering of his characters so terrible, that I could not empathise with any of them. Reading it was like listening to someone scratching on a blackboard, and I got to a point where I simply thought if I were any of these people I'd rather be dead, salvation was no longer possible.
Then came his shorter works and some of the old writer returned. There was hope and light with Unworthy of the Angel, one of the best short works I've ever read. And Daughter of the Regals, yes she suffers, she has absolutely horrible self esteem brought on by all those around her, but out of pain comes wonder.
For me Stephen Donaldson has to be one of the best if not the best fantasy authors around, but he needs to take his prozak.
Cheers.