I also stand by my comments on 8 Feb 2007: Stories should be about more than one thing, and Add a dramatic human component. Betsy built upon this comment on 2 March 2007 when she introduced her Big Bang Theory of Writing in which Good stories are about more than one thing and all these things impact at the resolution. This is VERY good advice.
Thus, to summarize, Good Stories
- are concentrated, with nothing extraneous
- are about more than one thing--one of which is a dramatic human element
- all the bits impact at the resolution
Piece of cake, right? :)