I used to date a teaching assistant who worked for one of the branches of NDI in Wuhan. She was a great girl. According to her, that branch had pleasant and co-operative Chinese staff. But many of the foreigners who came and went were arrogant and couldn't teach a bit. I met one of them by accident at a disco one night, and I'd say he fitted that mold. The Americans, which he happened to be one of, are the worst, both as regards their English, and their manners, so I was told.
Wuhan's a great city, but there are too many foreign backpackers there, and most of them end up at training centers like NDI. When their lack of teaching skills is exposed, they bleat online for revenge. Don't be fooled by their lies! REAL teachers reap financial rewards there!