I think they were all over-rated. My original point was the bias towards London-based players. Sometimes (read often) the original point is lost because people go off on a tangent to argue their own case...
From what I'm told by older blues and reds this was quite a thing back in the day, I would say this is less geography based in the modern game and more a case of the more media frenzied clubs players get more exposure of more international opportunities, ings and lallana being good examples at the RS.
I actually think campbell is somewhat underrated, possibly because he is a massive bellend, but he was a great defender, carragher was lucky to get as many caps as he did in my opinion, always simply a case of better players around. There may well be players who didn't get as many opportunities as they deserved because they never moved to a club with more media exposure, but I don't think the geography of the club matters anymore
Blues have always had a level of apathy towards the national teams, from what I have seen the kopites are just trying to 'out-scouse' each other by turning it into a hatred