Barnyard is a kid's game, plain and simple. Even for fans of the movie, this game is going to be just a little too basic. However, for kids looking for a fairly free roaming game that offers a variety of minigames, Barnyard is a good choice.
Every facet of the core gameplay is plain, making Barnyard for the GBA the most forgettable kind of throwaway entertainment. It's too bad, because it had the potential to be more than the usual mediocre film tie-in.
The mini-games range from mildly amusing (the raccoon-tossing one in particular) to dreadfully boring and bad (the fruit sorting game will be a frequent nightmare for me, I am sure) and the overall quality is unfortunately tilted towards the latter.