I like Lichentstein, my wife doesn't, I saw the Lichtensteins that were at the Modern Art Gallery, I was underwhelmed, I continue to enjoy them on a small scale. I'm right. And so is my wife. Art is funny. Art is entirely personl. No-one is right or wrong about what they like, because they like it. I prefer brunettes, others prefer blondes, neither is right or wrong. You can't 'choose' what to like (unless you're the kind of person who nods sagely at the little white placards proclaiming that the red splodge on a yellow background is reminiscent of the struggle for emancipation and brings to mind a parrot saying sausages).
As it happens I really like the Kelpies (less so his other stuff), love the scale, love the design, love the engineering, and personally I do think they're art. But that's my opinion, others are welcome to disagree with it, as long as they don't think I'm somehow 'wrong'.