Austin/Rock at Wrestlemania 17 couldn't have been any bigger than it already was. The hype and aura that surrounded the match (and the match itself) so eclipsed any previous encounters that it almost felt like it had never happened before. And again, I wouldn't wish away the epic Rock/Mankind and the very first (over the world title) Austin/Rock feud just so Shamrock could get a run with the belt. You honestly would have preferred Austin/Shamrock as the Wrestlemania 15 main event? Get real, dude. That would have been a pretty decent B-PPV main event, but Wrestlemania main events are supposed to be the biggest and most important matches of the year. Austin/Shamrock wouldn't have been that.
Not everyone gets a run with the world title. If Roddy Piper, Ted Dibiase, Jake Roberts, Mr. Perfect, Rick Rude, Owen Hart, etc. never got a run, then I'm too upset that Shamrock didn't either.