Being objective, yes. Other manufacturers like Synology and QNAP may offer better solutions. Generally the advantage (if you can call it that) of the My Cloud line is their cost is often less than a similar capacity/drive NAS from Synology and QNAP. The WD My Cloud line appears in many cases to be targeted at the lower end of the market where people don’t need a lot of extra capability and features. For some cost and not thinking one needs extra features beyond local and remote access is a driving factor so the WD My Cloud (or shudders the My Cloud Home) line of devices is what they buy.
You cannot connect the My Cloud to a computer (or other NAS) by way of the USB port on the back of the My Cloud. The My Cloud USB port is for expanding the storage of the device using external USB hard drives.
Generally one can have up to seven external USB hard drives (will likely have to use a powered USB hub) connected to and daisy chained off of the My Cloud USB port. But in reality some have discovered using more than five external USB hard drives sometimes is problematic. See this thread discussion. When connecting a external USB hard drive to the My Cloud the Dashboard will typically mount the entire USB hard drive as a single Share. It may or may not include the USB hard drive in the capacity total for the My Cloud depending if one enables the USB option under the My Cloud Dashboard > Settings > Cloud Access section.
For kicks and giggles see my post here where I temporarily put a 12TB drive in a first gen single bay My Cloud, then attached a second 12TB external USB hard drive for a total of 22TB. 
