The best analysis comes from actual expert in international trade: http://www.nytimes.com/2014/02/28/opinion/krugman-no-big-dea...
http://www.vox.com/cards/trans-pacific-partnership/what-is-t...
https://www.theguardian.com/commentisfree/2016/may/04/ttip-t...
http://www.slate.com/blogs/future_tense/2015/04/13/tpp_trans...
That's his argument.
He touches on the corporatist issues but the strongest statement he can make is "doubtful". He sees the whole things through a perspective of political process wangling and not how it is on its own merits (or lack thereof).