Apparently it doesn't matter which Hollywood film you look at, the plot will follow one of these 22 stories. See here for the full shebang. Using this model, my analysis tells me this:
1. Transformers = a classic 'Monster'
2. The Rock = somewhere between 'Quest' and 'Pursuit'
3. Gran Torino is another classic, this time of 'Maturation'. Albeit 'Maturation' with slight hints of 'Tragedy'
4. Zombieland, whilst an amazing tale, involving 'Escape', 'Maturation', 'Discovery' and 'Rescue', is ultimately a total 'Underdog'.
PS I hardly need point out that our 5th learning is my questionable taste in films.