in my opinion a good and good exchange presents a lot of factors including the volume of sales, the number of coins listed and the low fees that can be a good exchange and attract many investors or traders to be there.
The trading volume can be manipulated, it cannot be a factor that makes an exchanger a good exchanger. so I continue to argue that security and service for 24 hours a day is the most important thing in an exchanger to be said to be good.