Yeah, I'm fine with secret negotiations. I don't see how you could negotiate effectively if every offer and counteroffer were broadcast to the world.
However, congressional representatives should not be subject to that level of obfuscation. I want my representative to be able to oversee what's going on to make sure the general direction is in my best interests (I know, I know, corps, plebes, money, don't care about you, blah blah blah, I'm talking about the way the system should work, not the way it does).
And I don't like the rumblings I've been hearing about "fast tracking" TPP. I don't know how true that is, I've only seen it in passing.
Negotiate in secret, fine. But let my representatives review the process. And once the negotiations are done, publish the full draft of the agreement and allow a lengthy, lengthy time for the public and lawmakers to deliberate over the provisions.