Is there any method to quickly find a movie reviewer that matches my opinion on the quality of past movies, and therefore is likely to match it in the future? One way would be to go to Rotten Tomatos and exhaustivally cross-reference the scores of each reviewer, but I figure someone must have made something that will do it automatically. (e.g it gives me several films, I rate them out of 100, it finds which reviewers were most on the money.)
No. Reading a good selection of critics on a wide variety of movies you know well - and, most importantly, both like and dislike - is pretty much the only way.
The most useful reviewer I ever came across was one whose opinion was 100% opposite mine. If he hated a movie, I knew I would like it, and I pretty quickly learned not to even bother seeing the movies he liked.
Become a movie reviewer? 
For me, that reviewer is Janet Maslin. If she likes a movie, I avoid it. If she dislikes a movie, it goes right on my “movies to see” list. This has been working for me for quite a while!