Chrome: Movie review scores are pretty flawed. The most frustrating part is that you can't tell from a score whether the reviewers dislike a movie because it's bad, or just because they like different things than you. Heirloom Rotten Tomatoes helps fix this. Heirloom is only as good as the data its given about your tastes, of course. You can import your existing Rotten Tomatoes ratings if you have any. If you don't, or just prefer not to hand over that data, you can install the extension directly and just rate as you go. The more movies you rate, the more the ratings you see will reflect how you might rate a movie, rather than a throng of nameless critics.
The Chrome extension then filters through Rotten Tomatoes critics and gives more weight to reviewers whose scores more closely resemble your own. Rather than focusing on an "objective" score, you'll get one that aims to represent what your opinion of the movie might be. For example, after seeing Warcraft, I don't think it was a knock-out hit, but I don't think it deserves the 22 per cent thrashing that Rotten Tomatoes is currently giving it. After rating a few things on Heirloom, I'm given my new, personally-weighted score of 53 per cent. That sounds about what I'd give it. You can also scroll through individual reviewers to see how their scores and opinions stack up with your own.
Heirloom Rotten Tomatoes [Chrome Web Store]