Under-rated.
Graphics are just ok for the PS. Glitches happen sometimes which can ruin the experience but they're only in specific places in the game. Nothing to fancy here, actually quite dull. Not to mention the guy you control looks like rubbish.
Sound's not much to brag about either, you'll mostly hear recycled Digimon noises like battle cries, heavy footsteps, etc. I think the voice of the character you control is in Japanese.
All in all though, you should play it if you've got time to kill but generally speaking I don't recommend it because there are many other games you can.