I always thought the Dreamcast arrived way before it's time and seeing this game in action with it's controller-screen interactions brought back memories of me checking the VMU to check my health level when playing RE3. Dreamcast was my favorite console ever and I'm hoping the WiiU gets some nice titles like DC did to warrant a purchase.
That second level of immersion with the controller screen really fits a survival horror game.
Remember Final Fantasy Crystal Chronicles and Zelda Four Swords Adventures for GC? You could use the GBA as your controller for those games and manage inventory on screen in real time while your friends kept playing. In Zelda you could even go into little mini dungeons on your gba then when you exit you pop right back out on the big screen.
The cost and limited uses didn't make it the best investment, but for those who happened to have the stuff anyway it was a cool feature that really was a lot like the WiiPad.