Nope. Salient point: "You can't say a work should be something other than what it is." Further discussion carries on from there.
EDIT: Perhaps I should be clearer: You absolutely can say what you want within reason. That's the point of this forum and most social interaction. People may dislike or like what you say and react accordingly. On and on into infinity. Art is no sacrosanct. It's speech just like everything else. I can say, "I wish Naruto was scrubbed from his show because he's a horrible character." You may disagree and creator is allowed to do with that feedback as he or she pleases. Thus life continues.
I think there's a distinction to be made between criticizing the work itself and criticizing the morality of the work. It's the difference between "this work is bad" and "this work is bad for our society by virtue of being problematic/offensive/insensitive/corrupting/etc." The former says something about the talent of the author and the taste of people who support the work, but the latter says something, however indirectly or weakly, about their morality. The former type of criticism can be thrown out there, but the latter kind has more weight and should be more carefully considered before making it, and people making it expect it to be taken more seriously.
Regarding censorship, criticisms on the basis of morality aren't censorship, but censorship is almost always preceded by them, which is another reason people are more wary of that flavor of criticism. It would of course be fallacious to suggest that censorship necessarily follows, though.