No sure you can really call any series an 'all time classic' when a lot of the cricket played has been shockingly poor. It's entertaining enough, but moronic captaincy, brainless bowling, dropped catches galore, and idiots throwing their wickets away isn't really indicative of two quality teams going at it hammer and tongs.
It's a bit weird seeing 'World Test Champions' Australia only just overcoming this England side, but I think they are suffering a bit from being dragged down by a mediocre opponent. England definitely get a bigger 'Home' boost playing at Headingley than they do somewhere like Lord's, and I think that is a factor in narrowing the gap, but for all the slagging England have had for being poor I also think Australia have performed far below their best in this series to date.
Reminds me of the '81 series a bit, in the respect that the 1981 Ashes also contained a whole heap of shitey cricket, truth be told, but that's also regarded as a 'classic' because people only really remember it for the good bits and not the bad, so god knows.