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Really can't stand it. In fact, I found this question after googling 'number of people that like autoplay videos'. I haven't found concrete numbers yet, but it is my suspicion very few people appreciate them. And I was only trying to get today's weather forecast, when The Weather Channel blasted me off my chair. I am guessing that from a marketing point of view, it is not so much a turnof as it is an outright deterrent. In my experience people actively warn each other about sites that have autoplay on them. (i.e. 'AVOID')
Remember My Space, and how people would put music on their page that blared out whenever you visited their page? Do you ever thinking it was great to hear someone's chosen theme song every time you wanted to look at something? Yeah, neither did I.
If the client insists and you have to do it, I suggest making sure that there is a delay before the video starts, and include a prominent pause button so people can avoid it if they want to. Also, I would let him know that all that video is going to take up bandwidth that he is going to end up paying for. That might be your most effective point to discourage it.