Considering that Gorbachev is generally referred to as a person who is directly responsible for the collapse of the Soviet Union, by his own countrymen, there's no surprise he takes a harsh stand against Putin and his minions. It also isn't surprising that he lived up to his age, since noone really cares for what he says
But again, Putin and his clique aren't exactly subtle about what they do and where the country's headed.
P.S. For those who want some additional insight,
here's a link to an article written by an old buddy of mine.