Personally i don’t get Klimt,
I was going to stick up Caravaggio, but decided not to because it’s just a bit too obvious. I chose a Klimt for a few reasons. His technique, his technical ability was amazing. Just stunning, total mastery of anatomy and proportion. Stylised, full of emotion and expression and believable at the same time. His sketches show this best, he was technically as good as a renaissance master. Then his painting is a technical tour de force too, just his brushwork alone is stunning, but when combined mixed media (so naturally and effectivley) it becomes something else. Then, quite beyond that, the image has become iconic, it’s become popular cultural, iconic, cliched even.
So whilst you may not love it, I think it represents a lot of the key values of what it means to be great art. Not that those are “rules”. But it’s hard to argue with it imo.