That's because majority of Heisei riders are just regular humans in a power suit, which means they have to give it commands. Majority of Shouwa riders were shinzo-ningen, so they were already super human from the get go.
Kiva didn't have to do anything but release the constraints on his leg to do his kick, so its obviously a human vs cyborg vs inhuman issue.
The essence of Kamen Rider is not their character but a warrior of justice who fights for those who need him against those who are unjust. KR 1 may have been cool and what not and manly man but V3 was brash and hot headed. Kabuto was just an amplified by 25 times Stronger in terms of character.
It's not the character, the looks (you have to take into consideration what was "idol" material of those days), or look. But their purpose and morals as a Kamen Rider.
People seem to miss that, so caught up in this elitist attitude that Shouwa did it better.