I agree that comparing movies in different categories this way is awkward.
I think the idea of getting an ordering by pairwise comparisons (instead of discrete scores for each item) is sound, but it doesn't work as well for movies as for people.
pickthehottie.com (launched at least before June 22, 2001, according to the Wayback Machine) did the same thing to AmIHotOrNot's photo-rating juggernaut (launched in October 2000, according to Wikipedia). I think the A-B model worked really well for them, and the incentive for sticking around to compare for photos was a little more intrinsic.
I think the idea of getting an ordering by pairwise comparisons (instead of discrete scores for each item) is sound, but it doesn't work as well for movies as for people.
pickthehottie.com (launched at least before June 22, 2001, according to the Wayback Machine) did the same thing to AmIHotOrNot's photo-rating juggernaut (launched in October 2000, according to Wikipedia). I think the A-B model worked really well for them, and the incentive for sticking around to compare for photos was a little more intrinsic.