There's already plenty of group think with certain films. More and more very recently released, popular films are shooting up to the highest rated within a few days. Letterboxd should probably account for the recency bias a bit better.
>>jamesp+(OP)
Right, which is why I think there's more value in finding a couple of individuals whose tastes resonate with your own, and watch their favourite things, rather than pay attention to aggregated scores.