It's not, really, even if you consider the MGS thing (though I have not played this series yet, so I can't comment indetail), but it's like Mirage said. People who didn't like XIII, didn't buy XIII-2. A part of them may have been swayed by the changes they said they made, true, but the rest would give it a pass. Then some of those like XIII-2 enough to play LR. But looks like a lot of them were just done with the series by that point.