Austin/Bret & Bret/Owen had two of the best builds in wrestling history behind them.
The Michaels/Hall & Michaels/Undertaker matches featured amazing feats that WWE had never done before.
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.
As for "Edge/Christian vs. Matt Hardy/Jeff Hardy vs. Bubba Ray Dudley/D-Von Dudley", they didn't feature alot of wrestling holds that I remember.