...Would it just be easier to connect via usb for file transfer and streaming?
You cannot stream movies from the PC to the Mede8er via USB type-B connector (squarish one with 2 rounded corners) - that would only be for managing files on your Mede8er's drive and allows the unit to act as a 'dumb' slave drive.
If you have an external USB storage device though, you can stream from that - just plug it into one of the Mede8er's USB type-A connectors on the side of the unit.