I was thinking "interchangeable", but isn't really used on people.
How do you describe someone who is easily replaced by another person. The implied connotation is that they have no inherent qualities that make them more suitable for the job than any of their peers, it is just a matter of selecting one of them at random to do it.
Example I wish to fill:
"I complained that I didn't want to be in the conference call so they had Joe do it. Feels awesome."
"Feels awesome to be [interchangeable]?"