Bitmob - "It was the best of times, it was the worst of times" is a lot more interesting than "once upon a time."
In screenwriting, you're taught that you have about 10 pages to hook a reader. Games carry even more of a burden when it comes to catching a person's attention in the first few moments. Given that a title typically costs more than a novel or movie, people are likely to be very selective with what they pick up and play. This is heightened by the fact that there are numerous releases to choose from every year, each requiring a significant time investment.