"I would have preferred this writer explore these ideas" is an opinion.
"This writer has trouble with certain aspects of story-telling" is a criticism.
"This writer sucks and is talentless" is a mean-spirited insult.
"This writer should die" is a vile, shitty thing for which there is no excuse for saying.
Please learn the difference and please don’t pretend you’re doing one of the two former when you’re doing one of the two latter.