Hum... some people are naturally good at drawing. Others, naturally good at dancing. Others have this special ear for music. And others have an incredible talent for learning languages.
So I suppose some people are naturally good at reading tarot.
That said, no talent evolves without practice and study. Being born with Mozart's talent for music, or Da Vinci's talent for... a lot of things (lol!)... will mean nothing if you don't use it, develop it. It'll be a latent characteristic. Talent itself doesn't do anything.
Same way with tarot, in my opinion.
And just because you don't have the 'natural talent', it does not mean you that cannot learn and become good at it. The human brain is incredibly flexible, if you give it the opportunity to learn.
PS. I don't believe in these stories of people making their sitters gasp and cry in their first time reading cards -- no more than I believe in girls having overwhelming orgasms in their first sexual experience. It's just people trying to show off, if you ask me.