Kaiber Krystal...the GTN is pumping, we are all making a lot of money from it. Not sure what your issue is, but the trade network is fantastic for me.
As for the UI, there are some issues they have built into it trying to make queries more efficient. I would like it to be free'd up a little. But i am glad people cant use mods on it. If you take the time to spend 30 mins looking at items you can buy and sell for a huge profit. I like that.