I am curious to see if other people found ratings like these and what are your thoughts?
Well, fake reviews exist, saying the contrary would be naive. But does it really mean that all 3-4 lines 5 stars reviews are fake ?
Whatever how bad a game can be to the eyes of some members, there will always be members who'll like it for their own reasons. And with more than 6 millions members, it's not surprising to see that there's enough people with a bad taste (accordingly to your own standard) to praise a game that have previously be reviewed as being bad by people who don't have the same taste.
Regulars are the first ones to review a game, because they are also the first one to see it and try it. Having tried hundreds games, they have more point of comparison, and will judge a game more harshly. When you've played and liked
Desert Stalker, by example, it's obvious that the last, in date, game telling the story of a college idiot wanting to bang his family, will looks cheap in comparison.
And like it need time for a game to find its public through the lambda members, because they log-in once in a while, it's also not surprising that the members who will like that game, despite its possible defaults, will only write their review after weeks, if not months. And they'll do it more or less at the same time, during the few days after an update.
Plus, must not be forgot that creation is a constant learning process. It happen, more often that it can seem, that a dev, and therefore its game, improve with the time. And then, a game that started as average, or perhaps even bad, finally become something interesting.
This being said, it doesn't mean that there isn't fake reviews. But well, when you find a suspicious succession of praising review, for a game that on average have a really bad rating, just report the first one, saying that there's a series of review as surprisingly praising than this one. Moderators and staff members will do their job, and if it's another case of rating manipulation, they'll act.