Since I've started with the first version of my comic in 2004, I have gotten some unpopular comments =) Even with the version like it is now, there have been some XD
One of the most hurtful ones was during a convention where you could show your stuff to some folks from big publishing companies - I was told to get a style =/ Okay, I was... dunno, 17? 18? back then, but that still hurt. Today I'm pretty glad that I didn't try to get in there - the working conditions for comic artists in my country are really bad, you basically draw for $2/hour and that's a little... not much u_u
Aside from that, many people complained that "the first clothing designs are boring" (To explain: My main chars do not have much money, so fancy clothing was simply not in their budget XD).
And that my story starts of as a stereotypical fantasy story - like @MK_Wizard experienced, too (well... yes? I mean, I wanted to keep the feels of a classic fantasy story and then throw in some plot twists later on).
But tbh, that's less than 1% of the comments I have ever received - most of the time I get lovely comments, that make me laugh (or sometimes cry with happiness). I have really unique readers and they are super awesome! . Also, I LOVE it when my readers speculate about what happens next X3