Very good point. Harry Greb often get's called one of the Greatest but the only footage I have seen of him is shadow boxing (it's on YouTube).
I think we have to look at the fighters records which helps to establish the level of opposition they fought and also read reports of the time they were active. (boxrec)
Also there are very good sources of information via books that give a good picture of just how good the fighter was the usual History of Boxing style books are good references also a brilliantly detailed site called coxscorner is a fountain of information on many fighters from yesteryear.
http://coxscorner.tripod.com/
And finally boxing foums on the net are great aswell, as most know of posters who were around and are a good judge of fighters, 2 that I always read are called London Ring Rules and Dadgad - if you ever get the chance to read their posts then do as their knowledge of boxing is vast.
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