Overall I like the builder. It has potential, but here are the dislikes I would like WotC to address:
It doesn't like me hopping around to different steps. Boo! Making a PC is an organic process for me and I like to hop around and do things out of order. Crashed when I tried to save after skipping a few steps and doing things out of order.
No way to set my bastard sword to use 2-handed. It only gave me the option for one-handed.
No way to implement house rules that give me bonus ability points, feats, trained skills, and powers. This is really critical for me. All three of my 4e games employ these types of house rules. For example, one game I play in lets us start with higher stats and a couple of bonus feats and an extra trained skill and an extra square of movement. Another game allows the human bonus at-will to apply to the at-will stances that the Essentials fighters get.
No math breakdown. If I have +8 to something, I want to see exactly where all those bonuses are coming from. The bonus breakdown on the old CB helped me notice times when I took two feats with the same feat bonus in error.
Minimized feat categories don't stay minimized when picking another feat.
Need to be able to increase the size of the screens so I can see more options at one time.