Opinion = I don't care for this guy's work.
Insult = This guy is a hack!
Just because you put, "To me" in there, doesn't mean you aren't throwing around insults as though they are some kind of fact.
And if you think art is bad if you don't find it "pretty," you're missing out on the art world for the past century. There's a reason well beyond personal taste that certain artists become world-renown.
And people always say, "Play the game before you criticize it!" to the media. Isn't it reasonable to expect someone educate themselves about anything before they go condemning it?
