You still can't disregard the era, it's the 80s.
Using the era argument to discredit Swedish players from the 80s is silly. Swedish stars in the 70s and 80s went through the same kind of adjustment problems that the former Soviet went through in the early 90s. Just like you can't judge Fetisov or Makarov by what they did in the NHL, you can't judge players like Naslund and Loob by their NHL careers alone.
I think that that whole generation of Swedish players (Naslund, Loob, Gustafsson, Kenta Nilsson, Eldebrink) are terribly underrated compared to the 90s generation (Forsberg, Naslund, Alfredsson, Sundin, Lidstrom) because of the circumstances under which they played. Naslund was probably the second greatest Swedish player of his generation.
Swedish players in the 80s didn't grow up dreaming of the NHL like today. The SEL in those days was a league that contained all of the best Swedes, minus a handful that took a shot at playing abroad for a couple of years. Many of them went back to Europe while they were still in their prime. It's worth noting that Sweden had it's strongest performance ever in international tournaments (WC/Olympics) between 1987 and 1994, thanks to the strength of that generation.
Naslund started playing in the SEL as a 16 year old and went to the NHL as a 23 year old, to Switzerland as a 30 year old, came back to Sweden, and finished his career as a 35 year old in the NHL. This constant league switching make his career numbers hard to compare to other players. What you can say is that he was a star everywhere he went, and that he was a key player on teams that won both the SC, the World Championships and the Olympics.