The PlayStation Vita is an amazing little machine, albeit a bit pricey, but a console is only as good as the games that it has to offer. The Vita is still waiting for that first big hit to come out, but the strong selection of release titles already makes it a strong competitor against the Nintendo 3DS.
If you're familiar with Overlord or Pikmin, you'll understand the basic concept of Army Corps of Hell. In the game, you're the King of Hell and you command a large number of goblins with different abilities. You probably won't get tired of the heavy metal soundtrack, but unfortunately you might get bored of the gameplay. The combat is fairly stale and repetitive, with the exception of the awesome boss battles.