I just got back from a cruise on another line and it was great. I think alot of the time you get what you give. I noticed some in my cabin area not happy with some of the service but I did not experience any problem.
I think if you expect them to be a servant then I think you tend to treat them like that. I always look at them as someone on the cruise that can help me have a good time and to help me with onboard and shore info.
I could not do their job and have never really noticed any outward attitude towards me. Maybe just a "it's been a long day" attitude. We have all had those.
I have been on Carnival and Princess and both have been great so far.