A useful approximation of normal T levels in humans can be seen in present day hunter gatherers in Africa. The Hadza tribe was shown to have an average level of 151pmol/l, well below that of what we see in societies such as America. We can, therefore, argue that the reduction of T levels in modern man over the last few years is a shift back towards the norm.
Why not Farcry 1? It was amazing, and it would have been the best game of the year if not for HL2. I guess you're omitting it because this was pre-Ubisoft.