By the way, how did it go from almost a Straight 10 out of 10 all the way down to a 6/10?!?!
Everyone stopped voting for awhile, to identify the pattern of down votes (which Kiya and Rincewind kept track of). The down votes for Riftrunner came in short, periodic bursts designed to avoid tripping the spam alert at the web site. These votes did not correspond to any voting on other games, and the rate of voting for other games in the top 10 was fairly low.
It was not other gamers doing this, but someone specifically targeting Riftrunner.