User blog comment:Care Level/MVP Status/@comment-8802138-20130824204712/@comment-9593635-20130825135816

I already largely addressed that last bit:

"Some champions (like Annie and Kha'Zix) and roles (like ADC and Jungle) have more presence than others; they're more visible in games and so more likely to recieve votes."

This is true. The most complete solution would be to weight MVP points on a per-champion basis based on consistent ratings for that champion (for example, if Riven consistently scores twice the MVP points as Sona across all matches, points voted for a Riven would be worth half as much as those voted for a Sona after weighting), but there may be other workable solutions short of this.

Unevent, above, made a good point about champs with multiple roles having unreliable weightings; I'll address that there.