First, let me say I have total confidence in the controllers in the UK and the US. I think the UK system is under-resourced and so is less efficient than it could be, but that's not the fault of the people at the coal face.
To those who slate the whole US system because of an unfortunate human error at Boston: kindly compare and contrast the recent near disaster at BOS with the near disaster at LHR on 27 August 1997.
No doubt lessons will be learned and implemented at BOS, like they were at LHR. Shouldn't we be congratulating our ATC serivice providers on that??