Many people are not interested in the explanation for the result, they only want some authoritative source to tell them what to play. Same thing happens with people that choose films based on IMDB ratings only.
A debate is more "nourishing" if we have arguments in both side when we can agree together that some points can be more constructive than other in a side and vice versa. If we always take each thing in his absolute form, there's no point in debating.
Believing it requires less thinking is probably why a lot of people don’t report the fallacy corresponding to what they mean. Or just use it as a authoritative way to say the argument is false, and decrease the meaning and usefulness of this functionality.
A test could contain mostly no useful information when you don’t share the point of view of the writer. When a rating could tell you how much the game is liked by a great number of people, which could be very useful if you have mostly the same taste than the majority.