How big a problem is Rondo's Free Throw Shooting?

Rondo's free throw shooting issues have always been the big elephant in the room.  He is such a spectacular player in almost every other phase of the game that people are hesitant to criticize him for anything.  However, I think it is an important point to discuss.  Is Rondo's struggle from the free throw line a huge problem? Or is it something that isn't that big a deal at all? 

I used to be in the middle on this issue, but I think this could very well be a huge factor in the Celtics title chances.  First off, there really is no excuse for any guard in the NBA to shoot less than 70% from the line.  Free throws are absolutely something you can and should be able to get better at.  Your job is to play basketball, so shoot 2,000 free throws a day if you have to. 

I'm sure Rajon is trying, but he needs to try harder. The point guard should have the ball in his hands at the end of games and needs to be trusted to make critical free throws.  While it would be nice to have Perk shoot well from the line, it isn't nearly as big a deal.
 Rondo, I would argue has been the Celtics MVP this year.  He is a spectacular young talent and worth every penny of his contract.  At the same time he needs to hit free throws, especially in the clutch and also develop a three point shot if he ever wants to be considered in the ranks of the Chris Paul's and Deron Williams's of the world. 

Look, even if he had made those two shots last night  the game still would've gone into overtime with Baron Davis's shot.  However, the problem would still remain.  Though Rondo's free throw shooting has improved from the beginning of the season, it simply needs to get better if the Celtics are to win the title this year.

What are your thoughts?