I believe by "cloud your judgment" means thing like, say, trying to kill you wife to save her life, and deciding your best friend is the key to all the universe problems, etc. The darkside would do a pretty lousy job if the people who have their minds clouded by it sit back like idiots and die in extreme pain while being preached at by the person who defeated them. Causing you to lose control is causes you to lose control as in a burst of anger, like hacking someone's hand off because they threaten your sister. I cannot imagine the darkside making you lose control as in not realizing you could hurt someone when you could.

Imagine if in Return of the Jedi when Luke began to give into his anger and drift toward the darkside that he sat down, crossed his arms and started shouting, "I hate you, I hate you, I hate you!!!" like a little kid, instead of screaming out, charging at Vader and violently slashing at him until he took off his hand.

The darkside is suppose to cause death and destructon. Not dumbfound people into giving up and letting the good guy get away without a scratch. Have you ever been in a situation where you feel totally defeated? Ever been beaten up or humiliated by someone? Imagine a group of thugs beat you down, you're out numbered and you feel completely weak and helpless. It is an awful feeling. As you're watching these cock monkeys walk away from you laughing, your mouth filled with the taste of blood, your body numb from the beating, you'd probably wish you could bounce right back up and beat each of them to a pulp. I imagine that must have been how Anakin felt after having his freakin limbs hacked off. If there was ever times I wish I could reach out to some dark force and inflict great pain with it, it would be at one of those moments when I'm lying bruised and bleeding, completely humiliated and beaten. At moments like that I'd give anything to have the power to reverse the tides.