I suppose the atmosphere varied from congregation to congregation and region to region.
My recollection from the seventies regarding the two congregations I attended they lacked a spirit of care and warmth and had zero brotherly solidarity but there were some exceptions. Another one nearby was clearly very materialistic, their discussions were always about material goods, cars, fashion etc
A disappointed sister once told me the JWs in the past had a lot of love for each other that eventually disappeared.
I think their problem goes back to Rutherford who changed Russell's policies and put the emphasis on preaching and increasing numbers rather than on character development in other words on quantity rather than on quality and the JWs are paying the cost of this policy until now. The JWs as I remember them were like one dimensional spiritual caricatures focusing on the ever imminent end in a context of fear and otherwise had no real spiritual depth or substance as if love was not the central theme of Christianity. Their talks were always focused on preaching in the manner of Rutherford. There was no real effort to develop christian personality.