Well I, Borg really did touch upon the loss and regaining of individuality. Their plan to upload a picture that would drive them nuts was sketchy at best, and I don't think it would even work.
As for Decent... well that was a goofy episode to say the least. It wasn't even about the Borg so much as about Data and Lore. I don't see why Hugh's reassimilation would have any lasting effect. Don't they assimilate individuals regularly anyways? So I'm inclined to think Lore just somehow hacked that funkified ship so he could control those drones. Though even then the ship was way more powerful than the Enterprise and it took outsmarting them by luring them into a sunblast to beat them.