That's true of games, too. It's also good to know what plots, quests, etc, etc have been done a million times over and not do them again - or at least try to put a new spin on them.
Although sometimes it's fun to take a traditional cliche, then do something else with it. It all depends.
Execution matters a lot, too. If you take F1 and summarize the plot in two sentences, you'd probably roll your eyes. But the execution and the details are what makes it a classic.
And then there's the whole Batman issue. Batman is a guy who dresses up like a bat and fights crime. His arch-enemy is a clown. Personally, that is the dumbest friggin' thing I've ever heard... until I see the Batman movie, or read some of the comics, and the execution makes up for it. Well, it does for some people anyway.