Is there some magical feature of medium format that prevents you from taking bad shots?

Assuming not, digital gives you the ability to not worry about taking bad shots. Is it worth that much more? Dunno.

Or maybe you're making the argument that a medium-format camera is a relatively inexpensive solution for those who need super-high resolution photos only every once in a while and can deal with the worry of wasting film because they're only going to take a few pictures with it anyway.

But that ignores the fact that a medium-format body is still going to cost you at least $800 new (cheapest MF body with non-fixed lenses on B&H), plus the cost of lenses, which won't fit other cameras and which start at like $400 each.