Zubov is over-rated, if anything. He was a Norris-calibre defender for one season - 2005-06.
In that one season, he was absolutely elite. But that level of play shouldn't be projected back over his entire career.
For his first 5 seasons, he was basically a Russian Phil Housley. A brilliant PP player and passer who was rubbish in his own end.
After going to Dallas, he started to fix his defensive problems, but his offensive game suffered considerably. He averaged about 45 points/season from his move to Dallas until the lockout, which isn't exactly brilliant. He was a 10-15 overall defender in the league for most of this period.
He put both sides of his game together for one season in 2005-06, then started showing his age as he reached his late 30s.
If he'd had 5 seasons like 05-06, he might have been HHOF-worthy. But he didn't.
He played at that 05-06 level for the better part of his tenure in Dallas. You cant just stand back and look at stats and assume he didn't. He was vital to the Stars' success his whole time there. 50 points on Hitchcock's Stars is as good as 60+ on any other team. Labeling him overrated is absolutely insane.