I read the WOT series by Robert Jordan and enjoyed it very much.
It was a sad thing that he died due to some rare blood disease. He knew it was coming as he said on his website that if anything happened to him he'd left notes to finish the series with his wife and colleague Brandon Sanderson.
The last 2-3 books co-written were superb. The imagination for this story was amazing. I think you can't help developing favorite characters, and look forward to when they reappear.
Each book is at least an 800 pager so if you're looking for something you can spend a great deal of time in, then this story is perfect.
I had to wait a couple years for the final books to be written, but they were well worth it. I think it was January this year I got the very last book.
One of the best fantasy series ever written imo