This has been discussed here. Enoosti:

Yes, the paper clip reference wasn't the only point I was trying to make; it was just a (failed) cherry on top. I mainly took issue with being revived in the common dystopian vision: constant states of warfare, violence, and so on. It simply isn't possible, given that you need to keep refilling dewars with LN2 and so much more; in other words, the chain of care would be disrupted, and you would be dead long before they found a way to resuscitate you. And that leaves basically only a sudden "I Have No Mouth" scenario; i.e. one day it's sunny, Alcor is fondly taking care of your dewar, and then BAM! you've been resuscitated by that A.I. I guess I just find it unlikely that such an A.I. will say: "I will find Yvain, resuscitate him, and torture him." It just seems like a waste of energy.

This has also been discussed here. humpolec:

What you're describing is an evil AI, not just an unFriendly one - unFriendly AI doesn't care about your values. Wouldn't an evil AI be even harder to achieve than a Friendly one?

It has also been discussed here. Michael Vassar:

It would take quite a black swan tech to undo all the good from tech up to this point. UFAI probably wouldn't pass the test, since without tech humans would go extinct with a smaller total population of lives lived anyway. Hell worlds seem unlikely. 1984 or the Brave New World (roughly) are a bit more likely, but is it worse than extinction? I don't generally feel that way, though I'm not sure.