I quite agree that there hasn't been a better bowling combination than the Ws, but there have been quite a few as good. Donald and Pollock, Marshall and Holding, Lindwall and Miller, Statham and Trueman, Bedser and Statham, Larwood and Voce, McGrath and Gillespie, Ambrose and Walsh, Laker and Lock, O'Reilly and Grimmett, Alf and Ram, I could go on...
All brilliant combos and nothing, in my view, to overtly seperate them.
It's quite true that the best way to judge someone is to watch them, live, lots of times, but you can judge by asking (or reading) someone who has. It's not quite the same, but it is accurate too.
Statistics usually (and I emphasise usually) give a reasonably accurate impression of a player's ability.