Yes, the WTO dispute resolution system IS “exceeding expectations” but not in a good way.  Rather, it has blown past its assigned role (a.k.a. “standard of review”) and is making up new obligations that can only properly be adopted via new negotiated agreements.  Here’s a very telling review of some of the Appellate Body’s pronounced excesses, by Terence D. Stewart and Elizabeth Drake, published by the Alliance for American Manufacturing.  People who wish to take positions on how the U.S. should be looking at the WTO DSU going forward will do themselves a service by reading through this carefully.

http://www.americanmanufacturing.org/research/entry/how-the-wto-undermines-u.s.-trade-remedy-enforcement