To start, I don't consider myself a fatty, I'm only ~75kg with all my gear on and supposedly the stock suspension is designed for people around that weight.
I've also ridden quality full suspension mountain bikes and their suspension kicks ass, but they have so little bike weight to deal with... I don't think you can expect a bike targeted at asphalt use to get anywhere near that kind of comfort/dealing with bumps, especially at this price point. If that's what you are after a high spec dirt bike may indeed be the answer.
I'm 80kg and find that with just me on board I need the suspension on it's lowest preload setting. It seems to have been designed with a fattening world in mind! It sure isn't the most refined suspension ever, but I find it serviceable... If you find ways to improve it without too much expense please share. I would love to follow you!
ďNever argue with an idiot. They will only bring you down to their level and beat you with experience.Ē George Carlin