At least 40 mph cuz theres family rides that are not meant to super thrill you. You might think this is hard to decide but its our individual worst and not a poll to decide whats the worst in the world.
Man, I can remember the first day I really went to Kings Dominion and ride all the rides. So much fun really experiencing rollercoasters for the first time. Every ride was awesome including Shockwave. But now, thats the worst for me. I wish I still had the ability to be thrilled like that. Shockwave just hurts your jaw and head and doesn't do anything for me nowadays.