I think he has a point Naka only has that drive because of Toyota and him being Japanese and Toyota being too afraid to race one of their own unkowns.
and Piquet well he hasnt really matched the pace of his team mate over the 3 GP's as Alonso's last rookie team mate did last year. 
best pairing on the grid though? na most experienced yeah probably but thats about it.
According to Sir Frank, Naka earned the drive thanks to his good performance on his debut in Brazil last year, perhaps the Toyota factor's just a bonus allowing Williams to get free engines. He will come good I'm sure, but needs to get his finger out.
The most experienced pairing at the moment is actually Barrichello and Button, and either of them are better than Webber and Coulthard put together.

"And Mansell was lucky not to be taken off by that
RIDICULOUS bit of driving by Alliot!!" - James Hunt
"AAAAAND into the pitlane.....
OHHHHHHH!!!!!!!!!" - Murray Walker