With so many things, like music and books, the way you're introduced to something can mean so much about how well you like it. If you hear some piano music on an upbeat day, you might not really like it; if you hear rock on a mellow day, the same thing could happen. That's why I have trouble putting my iPod on shuffle. Depending on the mood I'm in, I won't necessarily want to hear everything that comes up.
It's also an outward thing, not just inward. Back when I was first introduced to Hamlet, the teacher relied more on the movie version with Mel Gibson. We didn't even read the whole play. Now, I'm no big fan of the crudeness in Shakespeare, and the movie really plays up that part, so I didn't enjoy it. Just the opposite. I'm reading the play again for class and, though it's still not my favorite, some of it's interesting this time around. All the double meanings keep your mind constantly at work. Minus the odd teaching style, I'm able to appreciate it now.