Gee.... These comments are the same as many CFIs have in the real plane world... the only difference is that you can bill them for no shows.. Some are motivated and others are not.

In over 5,000 hours of instruction given you get the ones that are happy, thank you and move on. The ones that go on to instruments and multi. And then the rare ones that go on to be instructors... just like in RC.

I'v been lucky I have three students that went on to be major Airline Captains and one that was the Chief Flight Instructor at the University of Oklahoma... she had a major confidence problem and used up three instructors before solo at 38 hours.. She was later hired by the FAA.

Hang in there take a break and enjoy our great hobby.. and thanks for your efforts.