What we do know is that Fetisov played on a very elite line on an elite team that generally played against inferior competition.
And then when they actually do play vs the best of the best, they go into it with the advantage that these players have been playing together with tons of chemistry for a long time vs other elite teams that have been slapped together a week or two previously.
What about when the Soviet national team or CSKA faced NHL teams, like in 1982-83 and 1985-86, respectively? Or is there the 'NHL teams didn't care' argument? Always catch-22?
Darryl Sittler, who was a color guy at the 1984 Canada Cup, called Fetisov "the best defenseman in the world" during the broadcast for the USSR vs. CAN semifinal. He and play-by-play man Ron Reusch were talking about how Fetisov's absence had affected (negatively) the Soviet team. Was Sittler just hyping/deliberately 'taking a little swing' at Bourque, Potvin, Langway, Coffey, Howe etc.? Anyway, I know that's just one opinion, but there are many other players, writers, whatnot too. Wayne Gretzky singled Fetisov out of all the Team USSR players, when he played for Team Canada in the 1982 World Championships. Is it really that hard to recognize a great player, even if "he's playing on an elite line" that has great chemistry? Heck, Coffey always played with elite lines/great players.
I've seen some theories that because the Soviets didn't have too many great defensemen, it made people overrate Fetisov. BUT Fetisov was actually widely considered to be the best player on Team USSR, not just their best defenseman. Some might have preferred Makarov, but as far as I can remember, most people thought that Fetisov, along with Tretiak (until 1984), was easily the most important player on the team. No one who watched him or played against him during the Eighties is going to say that he was not a great player. The same with Vladimir Krutov - whatever their NHL careers suggest.
Feeling a bit déjà vu
(this discussion has been going on before and will probably continue to do so in the future)