I have had only one poor check in experience in about 10 stays. All other interactions - bell services, valet, guest services, housekeeping, engineering - they have all been as expected or better than expected.
As someone else said - I have seen a lot of prima donna posts here, so I imagine there are some who grind on CMs. Here is one example of what I saw:
Although I don't know if this guy was a DVC Member. Last Dec we were at BWV. Fri night, I went to the Guest Services desk about 4:50 to pick up our Candlelight Processional stuff for Monday night. May as well get it early. There were 2 CMs at the desk and I was about 7th in line. No one got in line behind me until 5:05 when this man came up. By then, I was 1st in line. I moved up and started my transaction at exactly 5:10, I remember looking at my watch and a few minutes later, the man moved up to the other CM.
He said he had to get his CP stuff and he had a ressie at the Italian restaurant at 5:10

and would they please call and let them know they would be late. I looked at my watch again and it was 5:15. She said they only hold the ressies for 10 minutes (or 15, can't remember) and he started blasting her. And I mean he was rude. He said he had been waiting in line 1/2 hour (I knew this was not true, I hadn't been there 1/2 hr) and that it was their fault he was late - yada, yada, yada - I can't emphasize how very, very rude he was.
I will say this CM was exemplary. She never flinched, she handled herself so well. She just took care of it, called the restaurant and moved on. The CM waiting on me and I shared more than a few winks and I sincerely thanked him for his service and he sincerely thanked me for getting my CPS ahead of time.
Anyway - if the stories are coming from CMs who are treated like that, then I understand. I do think that the behavior issues can occur on both sides, but I hardly think a CM would pull a complete hissy fit like this guy did.
I'm very happy with how Disney recognizes my commitment to vacation with them year after year, and I have confidence that the recognition will continue to grow. As for relationships with CMs - I agree - you reap what you sow. I manage my own relationship with them and make sure each one I deal with knows I respect them, and when they fall short, I make sure they know I expect more in a polite, constructive way.