Don't be fooled by its pretty looks: Rengoku is a wading-pool shallow third-person hack/slasher that would be a 9.99 budget title on any other platform.
Think of all those great hack/slash games you've played. Now imagine that there's very little customization, even less in the way of options during combat, and lots more backtracking (considering this is a genre of fetch quests, that's saying something… here, you can't equip new items without going to a "terminal.").
This is Rengoku, and it is boring as all get-out. Untold Legends is a less futuristic, but more enthralling alternative for PSP-owning dungeon crawlers. Go with that.
-George