Did the writers even read the original books?
I really don't mind a few changes to make a series fit for tv or a movie, but keep in mind you will have two types of viewers for a show. Those who haven't touched the books, and those that are fans of the books and want to see them brought to life.
Whoever wrote the first episode alone of this series completely ruined it for many fans of the books. Certain things are done within the books for a reason, and to completely ignore them destroys that credibility of things. You want to make Darken Rahl Richard's brother, ok fine, that I can accept. But having prophecy being the driving force for getting the story moving doesn't work. Richard hates prophecy and will adamantly stand against having it dictate his life. Zedd wouldn't just hand Richard the sword and then let him run off with it. If he'd ended up using it to kill someone, as unlikely as that was with his skill level, it would destroy him.