Well Collberg is one of the top scoring Swedes all time, yet was a total bust. Leblanc looked good for Team Canada. The point is that people shouldn't put too much stock in 5, 6, 7 games. Subban wasn't even that good at the WJC's at 18 if I recall correctly.
When I think of Romanov I certainly don't think of Subban. Can Romanov be a top pairing D? sure, but do I see him being one of the top D's in the NHL that gets fans out of their seats with his puck rushing, spin o rama's, and puts up 50-60 pts, not at all. I see Romanov as a guy that will likely play solid at both ends, use his grate skating and mobility to play a good physical game. The big question I have is his offense, that's a very tough one for me.