I don't really get how this is IGF's fault. Unless they are directing the people voting to vote for one game over another, it's each judge's personal choice how and why they vote a specific way. I would guess that is common to pretty much every award in any field (aside from physical competition).
The rules and organization regarding judging are lax enough to allow things like this to happen.
Yeah, but no matter what the rules are, there isn't any way they can control WHY voters vote how they do. It's literally impossible. Any decision you task someone with making cannot be 100% objective.