I too enjoyed them a lot. However, if people have not read Donaldson's other fantasy series (well, only two books) they really are missing out:
Mordants Need: The Mirror of her Dreams and a Man Rides Through.
Two of the best fantasty books ever written imo; up there with GRRM.
Yeah, mordants need is an entertaining read, though I did get a little frustrated at the some of the main characters; you know, like when you shout at the woman in the horror movie who's going to check that noise in the basement .... I mean, come on, everyone can see the bad news bears coming from a mile off, yet, noooo off the blunders down the stairs even after discovering the light switch is broken.
Worth a read? absolutely.
To add to the list: The complete chronicles of conan (centenary edition) - all of R E Howards conan stories all in one unabridged volume. One of his other characters Solomon Kane is also worth checking out, though there is not the crushing volume of work like Donaldson's Chronicles of Thomas Covenant.
Tad Williams books of Memory, Sorrow and Thorn. are pretty good too.