That's it in a nutshell. Who says you are meant to be impressed? I like what I like. I'm not having someone else tell me I'm supposed to be impressed by something (not you, critics I mean)
But great art impresses many. Like it or not personally, Moby Dick does something in the history of English literature. That guy named Shakespeare too. Some truly great art goes unnoticed, but most great art does exactly what @LinekersLegs describes.