Camelot - Reckoning

So we finally get to the last episode of this show (as it turns out) and I think it went out with a bang (so to speak).  In fact I think this was one of the best episodes out of all of them and it shows the wasted potential this show had.
So Arthur has set up a series of traps to fend off the invading army at Broden's Pass single handedly.  While involved in one of these heated one on ones, it appears he is dead and his sword is captured.  A messenger is dispatched immediately to Morgan to let her know that Arthur is dead.  But Arthur is far from dead, and because of his selfless bravery, he is no longer alone.  His knights return to do battle with him and they successfully fight off all of the invaders, but not before one gets off a lucky shot at Arthur.  But the ever loyal Leontes, jumps in front of the bolt and takes the fatal shot himself.  He dies asking his king to look after his wife!
Morgan meanwhile announces to the people of Camelot that their king is dead and asks who should take his place?  Sybil the nun suggests it should be Morgan and the people agree, but before they can crown her, Arthur arrives and takes back his thrown.  In order to protect Morgan, Sybil takes full responsibility for everything and says Morgan knew nothing.  Sybil is taken out to an unmarked grave and beheaded, but not before having it rubbed in that Morgan does not even try to help her and that there is no God.
Meanwhile, Morgan goes to see Igraine and stabs her in her side because she thrust her from her home.  But Igraine shocks her by saying she saved her life, because her father was going to kill her.  She cannot believe this to be true, because if it is, she has just killed someone who did care about her.
Arthur strips Morgan of her title, her claim to the Pendragon name and removes all protection for her castle.  She is on her own.
Merlin announces to Arthur that it is time for him to move on and says his goodbyes.
Later, Morgan visits Sybil's grave and the devil she raised turns up.  She hears a voice tell her to bear a king.  That night, Guinevere turns up to Arthur's chamber and has sex with him.  When she leaves, she is revealed to be Morgan.  So Morgan had sex with her own brother!  By the legend she will bear a child, the evil Mordred, but we will never get to see that storyline, unless Merlin takes a turn for the adult!
This show was such a hit and miss affair.  The reason they gave for no second season was that they could not get all the actors back.  Having killed off most of them or sent them on their way, they didn't need to many of them to return, so I think this is a bit of a cop out.  I believe the show just wasn't that good.  Shame really.  What did everyone else think?