I see many people confusing the terms "worse" and "worst" in this thread.
The JW religion is worse than most other religious organizations. The JW religion is not the worst religious organization.
The worst implies there are none worse. There are some worse than JWs, so they are not the worst. But JWs are much worse than the vast majority of religions when it comes to endangering the physical lives of their members, endangering the mental health of their members, and taking away the freedom of mind of their members, all while knowingly lying to their members. This isn't even debatable.
On a percent scale, the Borg is probably in the top 10% of bad religions. Line them up against 99 other random religions and you'll find 90 that aren't as bad as they are (some of which may even be somewhat beneficial to members), a couple that are on par with them, and a handful more that are much worse.