When compared to the volume of any normal house, and the minimum air changes per hour to keep your living space healthy (mold, bacteria, etc.), you will find it swamps the make-up air requirement of any stove 10:1. That said, appliances such as large range hoods, clothes dryers, oil or gas furnaces, and radon ventillation systems can rob enough of that air that there is sometimes a legitimate need for an OAK.
Unfortunately, when the OAK inlet is located on the leeward side of a house in any wind, you may find it creates more of a problem than it solves. I believe this is to what Dennis was referring when he stated, "in certain conditions we did not like the result." This can be a problem if your wind doesn't always blow from the same direction, or if you're unable to locate the OAK on the typically-windward side of the house.
Wood Duck's theory about the OAK actually creating more resistance to draft may be a good one. I've seen it written before, and some actually recommend providing make-up air near the appliances most likely to use it (range hood, dryer, etc.), rather than at the wood stove. Of course, that only aggravates the problem of feeling cold draft in rooms not directly adjacent to the stove.
However, before getting into a long debate over the merits and need for an OAK, have you performed the exceedingly simple test to determine your need for one? Open a window in the room with a stove. Does your draft improve dramatically?
