I enjoyed the first five or so, but the latest ones have been a disapointment. Now it turns out that he's going to release some "prequels," staggering the release of each of the new books after one of the prequels. I'll probably read the rest of the series at the library instead of buying them.
If you want some other good epic fantasy, check out George R R Martin's "A Song of Ice and Fire" series.