Dominance (particularly when the number of matches you wrestle a year are in the single-digits) might be more useful in the old format of considering the participants to be in matches together, but in terms of contributions and legacy to the wrestling industry, Brock is much lower on the totem pole.
This is a list I made a while back, so it might be subject to change, of all the people I'd personally rank above Lesnar in terms of overall legacy and impact:
Click for Spoiler:
Of course, that's subjective, but other than his MMA career (which is more a testament to his legacy in MMA) and his dominance, why should Lesnar be ranked above Hogan, Thesz, Cena, Sammartino, Santo, Flair, Taker, Andre, Rock, Inoki, Sting and Savage?