Chances are that if you have been working in the CMS world for any length of time, at some point you have had a content editor say this - or something similar - to you. Blasphemy! How dare anyone disparage our beloved Umbraco?! Umbraco is perfect in every way! Joking aside, what they likely mean (without realizing it) is that they dislike the way their instance of Umbraco is implemented.