Given the actual strength of England, and not the mid-season imaginary sense that England are somehow just one or two players off being better than Australia, I'd say "abject failure" is utter bull. I'm with Harrigan, as IMO McNamara did a good job in general. Ignoring the fact that he's learning in the NRL whilst no other SL coach has had the nuts to try the same (particularly the high-profile ex players) speaks volumes about the biased abuse towards him.
The losses against NZ and Aus in recent times have been pretty narrow. Given the gulf in number of quality players, in what way are these "abject failures"? Swap England and Australia's halfbacks and the results would have been reversed, and then some. Sadly England doesn't have halfbacks of any note at all.