Why are my PS3 Graphics so bad?

it depends on the game. if it's some of the older games, the ps3 does look worse than the 360. but if it's a game that was made within the past 3 years, it should be similar. did you go into the xbm and change the output to hdmi? that should help significantly. if that doesn't fix your problem, then it might be your tv. my ps3 games look just as good as the 360, in some case, i think it looks a lot better.