Short and flat sure, there's nothing really wrong with using a cruiser if that's what you like. Up to a given speed and distance there honestly isn't much disadvantage with a cruiser and it's all about how it feels and convenience.

On the flip side, personally I wouldn't do it because I might want to take it for a longer ride some times or for errands and the cruiser could be a handicap for that. The two cruisers in our household seldom get ridden, my wife and son generally preferring the mountain bike.