My initial thought was that it seemed a waste. Being thin, there would be less creme and less biscuit compared to any other kind of Oreo. Double Stuff Oreos are amazing because there is a generous helping of yummy creme in each cookie.
Surely you want more of a good thing, not less of it?
I can guess why Oreo have made these. I reckon they're aimed at people who want to watch their calories and so if they eat a thin it's like eating half a regular Oreo (whether that actually stacks up I don't know - I haven't checked the KCAL numbers).
Whatever the reason, Thins are a great addition to the expanding of the Oreo line up (and my expanding waistline maybe - ulp!).
More Oreo reviews from the archives:
Oreo easter eggs
Oreo Ice Cream Sandwich
Oreo Peanut Butter Flavour