I use Mach 3 from time to time and I get as better shaves as with DE razors. Now, the difference is in time. I use the Mach 3 as it was intended to be used, and not how people that are sore about it are using it. I use it for a single, with the grain pass. The whole shave takes me about 5 minutes, while with a DE blade it probably takes me 10-15. I don't get a close shave, but good enough shave so I'm looking freshly shaved and there's no stubble on my face anymore.
Most people that are having problems with the cartridges don't use the property. They will do 3 passes and then cry because the bad cartridge gave them razor burns. Their popularity is not due to stupid people, but because they are better shaving instruments than DE razors are, in modern times. Try to shave in 5 minutes. You will get a much better shave with the Mach 3 that you will with the DE from any point of view. If you take your time with the DE or straight, you will get a closer shave. But not everyone have that time.
Same for me only one wtg shave
And i have relativly thick beard but I'm blessed because it's a mix between gignger and dark blond