I suspect the ones are jealous of the three's size, unless they think in terms of "third place", "second" and "first", in which case they're probably total asses to the threes.
To be honest though, who knows what a number really thinks. For example if ones are nice, and threes aren't, what is a thirteen like? Is it the sum of it's figurative parts or a separate entity altogether?
On another note The Unforgiven III is much like the second one.
Nothing to out of the box thats for sure... seems like an idea that should have been retired just like allot of the movie series out their that just don't seem to die. But what can you really say, Metallica has proven that they can do whatever they want, whether we like it or not.