Do I think Picasso's Guernica it's a beautiful picture or a pleasant sight?? Of course not!!
Do I think it's amazing? Yes. But it's gross, full of pain, anxiety, fear, horror and blood (despite the absence of red). It moves you, like it or not, you'll have something to say once you've stood in front of it... even more if you know what it's about. It was painted not make a room pretty, but to move and build consciousness. There's a very good reason why there's a copy of it at the UN building and why it was covered during the US announcement to go to war at the middle east.
Do I like The Dog by Goya?? Of course not!! Do I think it's amazing? Yes. It looks like an innocent picture, a bit boring. When you notice/read/learn it''s a dog sinking in a sand trap raising his head to catch a last and desperate breath it grosses you and makes you sick to your stomach, nauseated. You get the loneliness, the pain, the anxiety, the suffer, the emptiness, the resignation.
I could give more and more examples but my point is: Art it's an expression, it's not only meant to be beautiful but to communicate a message, an idea, a question, a thought, an emotion... It's meant to move you. The more it moves, the more it keeps you thinking, the more it keeps you feeling, the better.