My statement focuses only on riding on the street, which is your question.
I have not ridden a Harley or Honda, but consider a road bicycle to be the Honda Interceptor. The Intereceptor is quick and fast, and great for short rides and trips around the corner; however, when traveling long distances with motorcycles, riders do appreciate the stability of a heavy bike, and this is fat bike.
The first time I rode a fat bike, I immediately noticed the greater stability and control of the bike, not to mention its comfortable ride. The fat tires seemed to absorb all displacements of the road I would feel on my road bike. I felt very connected to the road, which may be because there is more fat tire in contact with the road than there is with road tire in contact the road.
Just about as soon as I got on and began riding, I was turned around, and heading back to the store's showroom, inquiring whether there were variations available. I purchased the Orange on White model out of a catalog, and had to wait a few months to get it. I didn't mind because I was convinced that I would never have another flat again. To date, it has not let me down.
When it was assembled and ready for delivery, I was struck by how handsome of a bike this was. The photos in the catalog do not do this bike justice. I would get compliments, sometimes multiple compliments, every time I took the bike out.
I should add: This fat bike is a street bike, which comes with a lifetime warranty from Giant. It becomes void only when the bike is taken off road. The lifetime warranty is a tremendous value added to the purchase.
I guess the Rocker 3 was engineered to be a city cruiser, which explains to me now, the casual design for the water bottle holder with the frame, and the emphasis of the Momentum line.
On flat ground, the bike has quick momentum, quickly getting up to speed. However, you will notice even the slightest uphill incline as the extra weight of the bike immediately translates into your burden for you to push forward.
I should say a primary reason for buying the Rocker 3 remains its use as an exercise tool for improving my cardiovascular health. When making the purchase, I did not consider the extra weight to be a negative. In fact, the extra weight was considered a blessing as it increased my exertion.
Later, I did modify the power train by adding a triple chain ring system, and the bike now has 21 gears.
So in summary, the fat bike is a heavy bike, and its weight brings a smoother ride, greater stability, greater comfort, and more control over the vehicle while on flat road. Uphill sucks, and the Rocker 3 continues to turn eyes, as ever.