Fat bikes, they are fun. Nothing more and nothing less They are the ideal beginner's mountain bike, we say this because have you tried to crash a fat bike? It is practically impossible. Fat bike tyres will keep you upright with no thought, they just do not want to loose grip.
They even work well as a commuter bike, street furniture just gets rolled over the top of. You will not notice those parked cars on your way to work. You will even become the envy of the office with your cool fat bike.