@xXHappy_PuppyXxIf you let the turret kill people, then you did it 'wrong'. What the much hated Boris players are doing is to put up a turret for spotting everyone and maybe attracting fire while laying in a bush/corner and then shooting said players.
The turret itself you could easily avoid before, so that was not the problem. The problem was to be spotted (even behind walls). This was nerfed and I guess all players should agree that this can only benefit gameplay (better would have been the removal of the sentry gun, but I guess they are not (yet) ready to do that).