As the game has changed so much you can really only measure players against their contemporaries. Now the 50s may have been a golden age for wingers, or then again it may not. I wasn't born then. I have heard that Boston, Mick Sullivan and others were legends of the game, but was that because they were so much better than everyone else before or since, or conversely that the others were rather poorer than different eras? In the distant future I expect that Ryan Hall (given the international and finals record he has already accumulated) will be spoken of in highly complimentary terms and people will be saying Briscoe for example, had to compete for a spot with him!
I know that some international and other representative selections have been (in)famously strange at times but on the whole it is a useful, mostly independent, way of rating a player's ability and as such it needs serious consideration when considering our selections for Hull's best.