I sympathise, but it's the same with all movies once you start looking at them in that way. Take war movies, for example. You always get:

• the tough officer that his men finally come to respect
• the grizzled old sergeant/bosun/senior non-com of your choice that you just know is going to get killed near the end of the movie
• the brash youngster who takes too many chances and has to be rescued by his buddies, but comes good in the end
• the coward who finally plucks up courage to do his bit
• the ruthless killer who invariably gets killed at some point, usually by showing some sort of humanity
• the lovable buffoon for light relief
• the enemy soldier who is either a loathsome Nazi and gets killed by the good guys, or is Just Another Guy who the good guys let live/let go

See 'Saving Private Ryan' for examples of most of the above (except maybe the buffoon, because it is a totally humourless movie). They're all the same. Doesn't matter, because it's a tested formula that works (as your SO knows with her favourite movies!).

Steve