It's especially interesting when something is widely enjoyed unlike, say, The Da Vinci Code which tends to polarise people pretty quickly.
See, here's the thing: I enjoyed The Da Vinci Code. I enjoyed the movie, for slightly different reasons (The fact it was a film entirely about someone who was clever figuring stuff out, which is a nice change and also, the final images? The Scholar Knight stuff? Yeah that hit me where I live) but I enjoyed the book. Weirdly, never bothered with Angels & Demons and HATED the movie version of that.
But, for me, there's a difference between enjoy and like. The Da Vinci Code was a pizza, for me, a piece of one shot entertainment that did exactly what I needed it to do and resided in my brain exactly as long as it should. I didn't like it, but I enjoyed the hell out of it because as a delivery vehicle for a one shot pop culture jolt, it was pretty kickass.
Oh I enjoyed the Twilight movies too. Not liked. Enjoyed.
Now, I can hear the internet's engines of derision already starting to power up but you know what? I don't care. Pop culture, which is what we all do, what we all swim in, is a massively broad church and there's no shame at all in enjoying something that's a little or a lot trashy. The trick, for me at any rate, is to keep your mind open, keep your horizons wide. Because there's some amazing books and TV and movies and games out there (The Dead Space Wii game? OH MY GOD! AMAZINGLY atmospheric and cool) and a lot of them sit out past the red line of your comfort zone. This being why I watched the Upstairs Downstairs sequel over Christmas, which was actually pretty great:)
So yeah, enjoy stuff, like stuff, TRY NEW THINGS, it's amazing what you can find.
On the fantasy side, I hear you. I'm not as averse as you to "fantasy" literature but I do think a lot of it is terribly derivative and dull. I actually don't mind derivative stuff as long as it's done well, but it so rarely is.
It's weird because it's possible to have exactly the same bad experience with every genre. I have, or had, issues with fantasy and I have a friend who won't go near horror because of some stuff she read when she was a teenager. Likewise, I have family members who won't go near any genre fiction but will read Stephen King because that's 'different'. Which of course takes us back to the pop culture delivery vehicle, and what Warren Ellis called 'airport fiction' and brings us full circle:)