I think one of the problems some critics have "Undertaker/Mankind", is that the falls happened at the start of the match and Mankind was still able to take Undertaker to the limit afterwards.
Biggest I've read is, it was essentially a great spotfest, holy
**** off the wall stunts, but as an actual match....
...compared to the first
Hell in a Cell which combined great wrestling action with some uber cool bumps to, it depends what you judge things on and what you want out of a match.