Haha, I know what you mean. anything IGN gives less than a 8/10 is automatically unplayable. That's the case with many people on MAL too unfortunately... :(
The iDOLM@STER is ranked 6.x something on MAL but I still loved the series, so I do call their taste into question. However it is true that most of the shows under 7.0 on MAL turn out to be pretty bad.