First, it'd be great if the top100 was more balanced, but the reality is, its not, and its not a big deal.
That said, I think its as much about TIME as NUMBER of reviews.
Example:
I think games shouldn't hit the "top100" until they've been out for 6 months. By then, folks are probably playing slightly more mature code AND, perhaps more importantly, enough time has passed that the emotional "hate rating" and "pin pumping" has subsided a bit.