I think that deckouts are best at taking out semi-stalls, decks with some CC and some damage. These semi stalls usually have the upper hand on rushes because they balance between damage and CC. However, I think that rushes can outrush deckouts. Of course, rushes are not the best counterdecks to deckouts. If they have SoGs you will want something like an enchanted pulvy. For firestall earthquakes will be priceless. It all depends on the type of rush and the type of stall, but I think every deck has something that can almost always beat it.