I've been using for a while a rating system that considers a "Watchability Factor", Acting and plot... The rating system goes from 1 to 10, with 5 points given to the "watchability factor", 2 for the acting and 3 for the plot.

The scoring works as follows:

Watchability Factor

5 - Spectacular! Worth watching over and over again

4 - Outstanding will watch several times

3 - Really good movie will watch more than once

2 - Good movie may watch more than once

1 - OK movie... but once is enough.

Acting

2 - spectacular, Oscar worthy

1 - Really good, enhanced the plot

0 - movie wasn't about the acting

Plot

3 - Spectacular, nothing else like it in the genre, nominated for Best Picture (Oscars)

2 - Makes you think well after, unique

1 - Interesting idea / story

0 - Run of the mill

Argo??? Three points for "watchability", one for acting and two for plot... for a total of 6 out of ten. Watch it, but it's just OK...