There's basically two sorts of people: the one's willing to overlook the aesthetics and the one's who aren't. There's a reason hospital staff wear them. They are not designed to look good, they are designed to let the humidity from your sweat evaporate instead of letting it accumulate into a damp breeding ground ripe for a host of foot conditions. For some people it will matter more than others.
There's plenty of Crocs designs that don't look ugly, but I hope they continue to be unpopular as that keeps them cheap. It's risky to switch to other brands with this sort of design, Crocs got it right.