This is not basketball. There are about 35 critical players on each team that determine record, not to mention coaching. If anything, outstanding players on inferior teams have proven themselves more valuable than great players who benefit from talent around them.
The QB position is a little different in that it is so determinative But myself, I still would reward impact more so than the final team record.
I get what the MVP award has become - the coronation of the QB of a Super Bowl bound team. There certainly is plenty of logic to this system in a pass-happy league.
I prefer to pick who I think really is the best and most valuable player in the league. Why? Because I can.