I only just finished the series a few days ago..so CP3 is really on my mind..
I reaaaaallllyyy liked Changqing and Zi Xuan..they drove me crazy XD
As for the overall feel of the story, I liked that CP3 was more serious and had more characters who could fight- something I didn't like about CP1. They also had more actions scenes and the side stories were actually interesting. I even liked the minor-ish character like Mo Mo..
I also really like how Jing Tian was so playful but cared so deeply for his friends.
The main let down IMO is his relationship with Xue Jian.. wasn't as interesting as I had hoped.