Yeah there's no sense in combining them. Or even averaging scores, really. Using a scatter plot you can get quite a good insight into the film at a glance.
As for which movies are the outliers, that you'll find out when you're a member :)
On your scatterplot, the correlation between the two scores looks incredibly high. By eyeballing it, I'd say > 0.8. Will you give the actual score in your upcoming post?
Ideally, it would be nice to find two axes that are orthogonal and let people rate on those. Clearly these two axes are highly correlated.
As for which movies are the outliers, that you'll find out when you're a member :)