In terms of domination, I'm not sure, but I think Paul Morphy outdid Bobby Fischer. Bobby fischer had a high level 20 win streak*, two 6-0 matches** against grandmasters. To be fair, steinitz had a 25 win streak and a 7-0 tournament score once. On the other hand, paul morphy was so dominating, he was beating grandmasters at pawn and move odds****. Morphy scored 85% in all his games (even if you exclude the non-match/tourney games, its still 79%) while fischer scored 73% counting all his games. Steinitz scored 67%.
But still, the best player of all time IMO is garry kasparov. His games are awesome, and simply he has gotten better results then anybody in chess in various lists I'm too lazy to referance (morphy may have had better results, but he was playing against the romantics. Kasparov was playing against players like freaking karpov)
*Soltis, Andy (2002). Chess Lists Second Edition
**Wade & O'Connell 1973, pp. 412-16, From Portoroz to Petrosian; Wade & O'Connell 1972, p. 345.
***Chessgames.com
****Morphy's Games of Chess, by Paul Charles Morphy, Philip Walsingham Sergeant - 1957
I feel Paul Morphy is a serious contender for best chess player of all time, considering the times and what resources they had then. Any thoughts? Comments? Who was/is the best? Past,present.