I noticed the same thing when Mystery Castle first appeared on the top 100 after getting 10 reviews. The next week there were 15 or 16 total reviews and it fell about 40 spots 14th to 53rd. Pretty sure some douche got pissed because it bumped their favs down a notch. While a few BS ratings probably wont do much to games like MM TZ AFM ect that have hundreds of people rate them some of the games with a smaller ratings sample can really be affected.