I've only been twice (recently) and there's only one CM who stands out as 'not up to standard'. We were trying to find our way to the F! seating area after our F! meal at RBT and got shuttled around from one line to another because the first CM told us, "Keep moving!" after we'd asked if this was the area we were to go to. Instead of actually listening to our question, I got shouted at and then redirected three more times before ending up where we first started. If it were just me, I wouldn't have minded, but with two tired kids and an easily-irked DH to deal with too, I was ready to just scream!
Instead, I worked really hard to keep my calm and ended up continuously asking each CM we saw where we were to go for the reserved seating area as we kept getting told either to move along or go "over there". It was frustrating and DH was ready to walk out of the park without seeing the show... on our first night!
We eventually did find our proper area, but getting shunted around by CMs who didn't seem to know what was going on, other than to keep the flow of traffic going, and who didn't take the time to listen to my question, just made our first evening not a great experience.
Two nights later, though, a CM at the gate allowed DH to come back in without his ticket (which I had for FP purposes and forgot to give back to him) because he proved he'd been in the Park by showing photos on his phone from that day. It was too bad DH didn't get the name, otherwise we would have put in a compliment at City Hall.
Every other CM has been helpful and friendly. So those are pretty good odds with the amount of people working in the Parks.