Which episode are you upto? I found the season started off very well, great opener, and then by the middle it seemed to run out of steam, and then improved again at the end. But I still loved it all (im slightly obsessed with it at the mo, and have just rewatched all the s4 episodes)
My favourite was definitely epi 3, the death of Uther came a s such a suprise to me, I was sure he would live. And the scene between Uther and Arthur, when he lay dying,was very emotional. One of my favourite episodes ever.