More and more products now come in clear bottles. Marketing companies have apparently decided that the quickest way to appeal to people is to let them see their product. While I generally favor transparency, clear packaging is not a good thing. I do not know exactly what happens with each product, but I do know by definition any colored product must absorb light and that light will eventually cause it to degrade.
In any case, if you have a choice between clear packaging and something else, something else is generally a better choice. See foodsafetysite.com for more information on this problem.