I can't decide whether I hated inFamous or Okami more. When I played inFamous, I felt like every single thing it did, it did wrong. But with Okami, the controls were broken to the point of the game being unplayable. One set of weapons is unusable, and if I hadn't found a different weapon when I did, I would have quit playing very early into the game. Then later, it was the combination of the extremely unresponsive brush drawings (HINT: maybe if everything wasn't a variation of a circle, it'd be easier for the game to tell what power I wanted) that needed to be used to beat a timed digging mini that required near perfection to beat that finally made me get rid of the awful game. I tried it over and over again for days. I tried all the tips all over the internet to make the game better understand the drawings I wanted. But nothing worked, and the mini-game ended in failure again and again and again due to the game being broken.
So I dunno. inFamous was extremely unenjoyable, but Okami was actually broken, and is the kind of game that should be getting those "1/__ - completely broken and unplayable" ratings and sit next to games like ET and Big Rigs: Over the Road Racing in video gaming's hall of shame.
So I guess in the end, the worst game I ever played is Okami, because it's a truly and undeniably bad game thanks to broken controls instead of just a game with no gamebreaking issues that I happened to strongly dislike.