Yeah, Magician was neat; the problem I found was that the second book just seems to start a new series / storyline (er, Silverthorn, iirc?) with little to no links to the first one. IIRC it's better in the 3rd book.
I stopped reading after that (I got a large part, if not all of the series from some elderly lady my mum used to work for, they were her son's, he died, I got them because I fixed her computer a few times), the rest just seemed like random stories about characters I don't care about in that universe. I actually (finally) donated all of them to charity a few weeks ago.