Hmmm, first impression are mixed, on one hand it's a technical marvel that is a truly lovely thing to see...on the other it's horrifically shallow in one player at least, maybe 2 player will be where it's at.
2 player mode is what this game is really designed for. Vs AI does have a progressively tougher AI and unlocked bonus (fifth monster and origin tales besides access to the Hall of Fame) derived in this mode so it serves its purpose but 2 player mode is recommended.