I don't believe you should to start xboxdrv as a service. Instead, just type from a terminal

sudo xboxdrv

and you should be able to test it.
You may need to run

sudo rmmod xpad

first.

When you want to use it for gaming, mind that you run

sudo xboxdrv --silent

instead, as printing the events to a terminal hogs a lot of CPU.

Note on what you were trying to do: I have xboxdrv successfully installed, but running

systemctl enable xboxdrv.service

gives me

Failed to enable unit: Unit file xboxdrv.service does not exist.