They are not good cartridges in my opinion at all.
I took a load of game cartridges out to test with my dad and the Gordon recoil system gave the one of the worst recoils in our blind test selection. Incidentally, the best cartridge we tested was the old fashioned green-cased Gamebore Super Game. Clean burning, smooth shooting and decent shot weight, the wheel did not need reinventing when we tested it!
It's just fads, nobody tests anything yet every Gun repeats the same old dross at the dinner table about which cartridge is really good. Nobody likes to be the odd one out so everybody agrees like sheep that whatever the fashionable cartridge is at the time is the best.