Okami has been heralded as a great title by many critics, but the game never received equal success at retail. The game came out late in the lifecycle of the PS2 (Fall 2006 in America) and may have been overshadowed by the already available Xbox 360 and the impending PS3 and Wii.
“I can’t comment officially but, personally speaking, I think it had a lot to do with the announcements for new consoles,” said Capcom producer Motohide Eshiro. “That was overshadowing any other game news at the time.”
The sequel Okamiden is set to release for the DS on March 15, mere days before the official launch of the 3DS.
Source: Official Nintendo Magazine