Guys, as far as the MVP is concerned, it is a Regular Season award. So don't bring up his not winning the finals having something to do with with winning the MVP. (It could be argued that he is overrated cause he can't win the finals, but that is different than deserving the MVP in the year he won it).
As for his defensive weakness, I agree with Big Ticket that it is definitely overblown. Suns team D is terrible. Really bad at rotations. And of the other point guards in the league, a few are definitely better than Nash, but I wouldn't say anyone is really a lockdown guy. To say he isn't good because he is only strong on the offensive end is just not accurate when comparing his defense (taking his team's support into account) to other players.