PlayDevil has reviewed Disgaea 4: A Promise Revisited for PS Vita
Here's a snippet:
"It's a surprisingly simple system for such a complex game, and one that I loved getting to grips with all over again. The main meat and bones of the gameplay will be spent replaying missions and delving into the item world to increase everyone in your party and the attributes of their weapons. Whilst these sessions are grind-heavy they're incredibly rewarding and always fun to participate in."