Remember, Satyayug is only accepted and believed by Hindus, so the entire parameters to determine if Satyayug was the worst period for humanity is within our PURAANS only. And in this information age the parameters are known to everyone.
1. Number of avatars in that Yug : We know that avatars come as humans or even as animal when certain corrections are required (READ: Avatars Defined ). Satyayug had four avatars, Treta Yug had two Dwaaper Yug had two and Kalyug has had NONE so far, and according to Hindu belief shall have one. And there is one avatar called Matsya Avatar during the in-between period of Kalyug and next Satyayug. The conclusion is obvious. Avatars come on this earth when the problems are unmanageable for humanity. This parameter clearly establishes that Satyayug was WORST and Kalyug BEST.
2. Cyclic theory of evolution: The start of any new era is always accompanied by exploitation of females and weaker section. This is compounded by the fact that some people of earlier Kalyug enter this new Mahayug after a long and tough journey over sea. Read post: MATSYA AVTAR IN LIGHT OF GEOGRAPHICAL CONDITIONS. The fact remains that cyclic theory together with theory of Karma clearly indicate that the maximum number of persons moving towards MOKSH(SALVATION) , could be in Kalyug, as it is THE END of Mahayug, i.e. people have, through the long process of repeated births, as per the theory of Karma, have improved themselves. Once again it establishes that Kalyug is a better Yug for humanity. We know the serious problems we are facing. Yet there is no Avatar. That means the problem in Satyayug were worst.
a) All Puraans contain vivid description of wrong and deplorable deeds of Rishis and Maharishis. I do not intent to discuss this here. But take any Puraan, and the inescapable message(s) are there. Their behavior also provides the explanation why they are trying to exploit the Hindu Society. This is the continuing unending trend. If one wants to have some glimpses of this read : Pre Ram Era..Dharm used for exploitation of females..Ram ended this.
b) Vaanars were evolved humans of Satyayug. Unlike humans of earlier YUG who came in this Mahayug from earlier Kalyug, they were the children of this Mahayug. Yet they were treated as animals and only in Treta Yug during Ram Avatar they could be provided with equal status.
Perhaps that is the main reason why Hindu religion could survive for such a long period of time. So please understand Gurus and Religious preachers have a responsibility to improve the condition of Hindu Society on the basis of verifiable parameters.
Please also Read the Hindi Post :