Rudolph A Liability At #3 ??

I can't help but wonder. #3 being such an important spot, Rudolph has hardly justified hanging on to it. With the Pontings and the Dravids and the Sangakarras gracing this honour for their respective teams, Rudolph certainly seems out of league. He averages 39 after 26 tests - not bad but not special either. In today's world way too inadequate for a 1-down in my opinion. Take out the 222* that he made against Bangladesh on debut, and he averages less than 34 !!! He did score 154* and 93* in New Zealand last year and a 100 (albeit a painfully slow one) in difficult conditions in Sri Lanka; but he is painfully slow for my liking - especially when a giant of the modern game Jacques Kallis is waiting to bat in the dressing-room. I think Rudolph is definitely a reasonably good player but for now he should be probably #5 maybe 4 but definitely not 3.