Speaking from the perspective of someone who just likes to play console games now and then, Okami provides hours of fun, and is easy to learn and play. It's appropriate for kids and adults alike (for those concerned about graphic violence, when an enemy 'dies' there is no blood or gore, they just float and disappear in one way or another). I love the unique and beautiful graphic design, and the story/main quest is engaging and easy to follow. All of the different areas in the world are interesting and there is plenty to explore. There are also shops conveniently placed all over the map for you to buy helpful items and weapons.
Unlike some other RPG/open world wii games, this game utilizes the wii remote's motion sensing abilities a lot (i.e. shaking and swinging the remote), especially with fights and with drawing (which occurs a lot!), so don't be surprised to have a hurting wrist after hours of vigorous play! It does allow for a more physical experience of the game though, so I would not say it's a bad thing at all - it adds to the experience.
Ultimately, I would highly recommend this game to anyone - and for such a low price, I would say this unique game is a must-buy! BEYOND worth the money.