If the DC top tiers used their superior-to-their-Marvel-counterparts speed in more than 50% of their battles, I would acknowledge it, and then certainly in most situations the DC top tier would beat the Marvel top tier decisively. But Diana almost never blitzes (she does bullrush some), Superman almost never blitzes (he bullrushes pretty often), Martian Manhunter, Power Girl, Supergirl, etc, all suffer from it. They don't blitz anywhere near half of the time. 33% of the time would be being generous. So, no, it doesn't play a huge factor for me when I'm determining the outcome of a match that has a DC vs. a Marvel character.