Suggestions of banning misleading advertisements are extreme, IMO.
If claims made in the ads widely differ from reality, there will be a major hit in sales and the company will be ridiculed. The ads will be yanked voluntarily and heads will roll.
Much better than putting another piece of legislation in place that may or may not be enforced.
Edit: I don't honestly think heads will roll over the ipad screen's visibility in daylight because I don't think most users care. Some at MR do, but we're not normal. We're above average.