Sometimes the simplest questions are the best.
Ethernet is great.
There is huge hype surrounding it. Having been buried by the Ethernet avalanche, any discussion of its benefits is largely academic. They've done an impressive job in an array of areas. This approach multiplies rather than divides bandwidth by the number of devices on the network and is the essential ingredient for building truly scalable networks. But, to return to our initial question, what Ethernet is not is a circuit-switched system.