See, when I first started reading fanfiction. The first ones were Mary-sues. But I quickly started hating them because they were the same story, only the girls names would be different in each story.
As for the bus-crash or place crash stories, those i like better. They have action in them and they led to different plot lines, when you think its going one way, its takes a left turn and your like 'what the monkey?!'.