Tablets are supposed to be versatile that is the whole point. If it is so landscape based, why does it have a orientation lock? Why do any apps appear in portrait at all? It's not like a laptop in the way that there is no "right way" to hold it(bar stupid options such as screen facing away..). IMHO all apps should be formatted for 0,90,180, and 270. For instance, I like to surf the web in portrait because there is less 'weight' trying to turn your wrist in portrait than in landscape, but angry birds is really probably best in landscape. I don't see why a portrait market sounds so outlandish.
To each his own I guess...