Where Does the Google Adsense System lack?

Payments should be made by Paypal (or similar services)
A really key issue for international revenue growth. On top of that not fixing this issue will soon hurt Google in international markets really badly (not only missed revenue but missed business opportunity). I am sure Google is aware of the first mover advantages on online marketing revenues, it enjoys in US. The game might not be the same unless Google wisens up internationally and starts to move faster.
One should be able to use his/her earnings of Adsense on Adwords accounts.
(Shouldn’t be the both systems integrated? I am sure you are working on it, but be faster.)
Anyway till the integration is complete you should use at least Paypal or similar payment systems for the earnings.