I only use imdb to look up cast names, I don’t look at reviews (let alone write them). I’ve never used rottentomatoes or metacritic either.

I (sometimes) used to leave reviews on reddit, always in new episode posts on a tv show’s sub.

Nowadays, I might plausibly leave a review in the comments on a relevant post here on lemmy, or if my opinion was solicited in one of the discord servers I regularly spend time in.