Is it worth it? No shot at any editorial board positions, I would assume, but do you pick up some skills you'd miss otherwise?
{p.s. sorry this thread is out of place}
As opposed to what? As opposed to doing nothing? Yeah, it's another line on the ol' resume.
You'll get better at BlueBooking, and editing, and hopefully writing. Do you have a chance to publish? Are you interested in the subject matter?
I'd say do it unless it "costs" you the opportunity to do something else.