I don't really see
@OrangeBowlMagic as a slurper, though I can understand why people include him. I see him as more on the optimist side and sometimes rationalizing bad acts/results, but he is still critical of the program and acknowledges its failings. I don't think the true slurpers do that.
Instead of this Yes/No, Mope/Slurper dichotomy, I try to think of posters on more of a scale:
Slurper --- Enabler --- Optimist --- Realist --- Pessimist --- Prohibitor --- Mope
I'd guess about 2/3 of CIS falls in the middle three (though most people who call themselves "realists" are just pessimists/optimists who are unaware of their own bias).