Ari LeVaux stands up for boxed wine:

Go buy a box of Franzia Cabernet (not the Merlot or Chianti), which I consider a decent yardstick of value in a good cheap blend. The box costs $15 for five liters. A standard wine bottle has 750 ml, so the Franzia works out to about $2.25 a bottle—about what they pay in Europe for a bottle of good, cheap wine, usually blended. Do a taste test comparing that Franzia to any $15 bottle on the shelf. Unless you choose well or get lucky, the Franzia easily wins at least half the time. And even when it loses, ask yourself: Was the bottle seven times better than the box?