4/10 sounds waaaay too harsh. Judging from the review, the game deserves a 5 at worst.
And I also don't really care. I loved XIII, but haven't played XIII-2. I played the demo and it was pretty weird, but this one still looks pretty cool to me, I'll be sure to give it a try.
But it makes you wonder why they even made XIII-2 to begin with. After X-2, I'm pretty sure people were not exactly happy about another direct sequel in the main series. And then they do ANOTHER SEQUEL? It will bomb, but unlike popular belief, not because the series is dead, but people just don't care about anything other than the main series, with some exceptions. It has always been like that, and Square should give up trying to treat these spin-offs as major releases on the series.