In my opinion all the suggestions are proper criterias to evaluate the MVP.
I for one dont care which one in particular is used. The thing that irritates me, is that those paramiters are never set on concrete. I think thats on purpose... to able to use what ever one personally feels (the voters) with out being wrong...
But again in my opinion, I would prefer that the meaning of "MVP" be set in stone, so that it could be understood who best fits the description according to the award givers.
