I just picked the game up on Friday, and it is excellent. I will go as far as saying it is the best game I own to date. I am only 5 hours in right now, and I am just amazed at the colors and gameplay. I think I may have to get Zelda TP now, because people keep comparing it to that. Don't get me wrong I have fun with games like Boom Blox, RRR and Mario Party 8. The fun just doesn't last.
PS. If you don't have Okami get the F*** out there and pick it up