I'd definitely recommend reading WoT. Although it's certainly not the best thing I've read, it's definitely one of my favourites. It has depth, mythology and a broad character list. It's not quite as dark as a few of the other series out there, but there are certain scenes which are quite troubling.
In terms of the "slump" everyone talks about - books 8-10 - it was initially regarded as a slump due to Jordan reducing the speed in which he released books (1990-1992 for the first 4 books, but 1998-2003 for 8-10), so things definitely slowed down. Also, there does seem to be a lack of action in those 8-10 compared to the earlier books, however the slump books do contain some of the most important and momentous events in the series before things pick up in book 11, which is excellent.
I'd go as far as to say that books 1-6 are some of the best fantasy out there.