I'm also adding a +1 to this idea.
So far I haven't seen any reasonable argument for not adding this feature.
This isn't the only film recommendation site, and personally I don't really feel like entering 100's of movies to every service I try. I was told by a mate to check out this site, and by making things easier for people, they are more likely to actually use the service and experience it - and get hooked!
More to the point, many other competitors sites have implemented this feature, eg. filmaster.com
Seems like a no brainer to me...