All the arguments in this thread against the OP have been built around an understanding of the OGL as a contract. As well as section 4, you'll see that section 3 refers to offer and acceptance.
A licence is a relationship to property - roughly, a permission to use it while not actually getting any interest in it. When you have people over to your house, your are granting them a licence. (That's what makes them not trespassers.)
A licence can be granted gratuitously - as when you have your friends over - or can be granted pursuant to a contract. The OGL is clearly a contract.
@S'mon understands EU consumer protection law, I am guessing. But my own intuition is that a work is not faulty or defective simply because there is some confusion over the licensed rights it can confer. If you're buying a work in order to get the benefit of a licence that is offered in it, I'm not even sure that you count as a consumer!