I love the series but unfortunately I have to agree with MoW that the series is simply becoming too complex with too many characters to keep track of.

My favorite book would have to be the third one. My favorite POV characters are probably Jon Snow, Daenaerys and Tyrion, although Sansa and Arya are good as well. I also thought Jaime's POV in the third book was excellent. My favorite non-POV character would have to be Sandor Clegane. There's just so much to reccomend about this series.