What games have you noticed this sort of stuff happening with? Also what percentage of the reviews like this do you consider to be suspicious, since there are some people who might play for a few days, leave a positive review and then get sidetracked by their life or another game without anything sinister going on. I feel like it would have to be a fairly large percentage to even begin to prove your point, but hey I'm open to it.
I don't mean to give you "work" but you sound you are talking out of your ass and have basically said you don't have any solid proof, so I'm interested in your fuzzy proof.
Anyway I like the game and I talk with people who are also liking it, so it getting good reviews is not suspicious to me.