That question gets directed more regularly to financial writers as well as on personal finance internet sites. The random part, would be that the question itself is meaningless. Its like asking what is a great football score, or what's a great color. The solution depends solely upon why you are asking.
For example, best color for a hunter's safety vest is orange, although an excellent color to paint your calming reading room is most certainly not orange. What makes a good credit score depends upon precisely why you are asking also.