I used to use a Mach 3 and I thought I got a pretty good shave. After switch to a DE, the shave was WAY better but the stubble was WAY different too. Evidently, I'm not the first guy to think this either. I found this picture of stubble cut with a Mach 3 with new blades and a DE, 2 days later. The Mach 3 cut halfway into the hair and peeled the rest off. The DE gave a straight, clean cut.
Mach 3 vs DE; stubble