Vincent van Gogh is such an artist. When he lived not a lot of people thought he was good. Only much later people noticed he was ahead of his time.

But I also think you sometimes need to learn how to look at art.

For example Piet Mondriaan is a like Picasso. They both slowly transformed into the abstract. In the end Mondriaan only created lines and colors. So it is easy to think that anyone could create such a painting. But a trained eye can see that there is balance in Mondriaan's work.

But in the end it's all about taste. Personally I don't like Van Gogh's work very much.