In Apocalypse Delayed James Penton argues that the Witnesses, while giving lip service to the sola scriptura concept of Protestantism actually bear a closer resemblance to the Catholic Church, paricularly in their authoritarian structure. Their elevation of the governing body above all is strikingly similar to the magesterium of the Catholic Church, but the Witnesses would never admit to it.
After giving it some thought, I can't say I disagree.