I've taught grade school, middle school and young adults in China. Seems to me the ration of motivated vs. not-so-motivated students is about the same as anywhere. There will always be a portion of students, at any age--any where--that won't be clinging to our every word. Sorry for the breaking news, but sometimes we ain't real interesting.
The other problem is that if a corporate class is paying for their management level employees, they may not be as motivated to excel as if they were paying for it out of their own pocket. Surprise! Like when dear old dad paid for the 1st year of college for me, and I got B's and C's. But as soon as I started paying for it myself, they went to A's and B's. That's pretty common.
Don't worry too much about "connecting" with each and every student. It just won't happen.