I’ve not had my car yet (Thursday) but I’ve been floating around these forums for about a month and can say they read no differently to any other car forums I’ve ever been on.
Rather inherently people tend to come to car forums (or the internet) to complain or ask questions, and those who ask questions often get responses from others who’re there to complain and talk about their issues even more which only leads to more percieved negativity.
As above, these forums don’t feel any different to the Honda, Peugeot, Porsche or Range Rover forums I’ve visited before, it’s just the issues here are often more unique