There are many stories in the online forums. It's hard to know how general a problem it is since people tend to be there to complain about something :).
My 2004 transfer case has given me no problems except for a minor seal leak that they fixed under warranty. But if you asked about electrical problems and the front suspension links, that would be another matter. I will shortly be starting in on my third set of tie rods in the front at only 110,000 miles.