My visits have been few and far between, but I think that while there are things that I really miss (River Country comes to mind), there are plenty of things that are better than before. I think it's easy to say "things were better in the old days" because in the old days there weren't 6 parks and 24 hotels to manage, staff, and maintain. To expect yesteryear quality today is unrealistic and, IMO, unfair. WDW is a *huge* place, over 30,000 acres, and it must be the biggest logistical nightmare of all time trying to keep it clean and in working order 100% of the time.
As for less-than-stellar CMs, I'm sure there are a few in the army of employees Disney has. I'm not excusing bad service but according to a lot of what I've read on these boards, these people are supposed to do their jobs perfectly every single time, remember to acknowledge each and every guest's special event/need/whim no matter how small, dispense endless amounts of goodies freely and equally, and never show any emotion other than absolute elation, because after all, they work for Disney, so that apparently makes them immune from bad days, grumpy moods, real-life problems, and mistakes. I worked in the service industry for years, but never in a place with standards as high as Disney's, and thank goodness for that. The pressure on Disney employees must be immense, especially since it seems more and more visitors to the parks feel that because they paid good money to visit, they should be allowed to behave in any uncivilized way they choose if the slightest thing isn't to their liking. JMHO.