Because some hockey fans are strange, honestly. In baseball, most historians say that if a drunken, overweight Babe Ruth could hit more HRs than entire teams while swinging that club, he would have no problem dominating the game today. Basketball fans say the same about Michael Jordan. Even in the music genre, you never hear music enthusiasts claiming the hottest new band is as good or better than the Beatles. When will there ever be another Michelangelo? Umm, probably never.
Hell, there's a reason The Godfather and Citizen Kane are still revered as the best motion pictures of all-time by film buffs. Bach and Mozart are still considered the best classical composers of all-time. My point being, greatness is greatness. And every 1,000 years, 100 years or 50 years or whatever, we are blessed with the chance to witness unique talent that will never be matched again. Bobby Orr and Wayne Gretzky are those talents when it comes to all-time NHL forwards and defensemen. Plain and simple.
Only in hockey, for some odd reason, do modern fans thrive on discrediting what the all-time greats in past years accomplished. And to be honest, I don't understand it. To say ridiculous things like Orr wouldn't be able to go end-to-end today, or that Orr wouldn't win as many Norris trophies today because the overall talent in the NHL is better is just like saying Mozart would "just be a real good composer today" because music schools have improved. It's utterly ridiculous, ignorant and disrespectful.
Bobby Orr dominated - repeat, DOMINATED - his era. He was a defenseman outscoring all-time greats and Hall of Famers like Lafluer, Perreault, Mikita, Esposito, and Clarke. I think it's safe to say he would be a safe bet to beat out Henrik Sedin for the Art Ross and Duncan Keith for the Norris. Some of the statements discrediting Robert Orr in this thread are unbelievable.