Board Thread:Theories and Speculation/@comment-1872728-20151019025302/@comment-1512913-20151019084458

Itachi's Susanoo is yellow, it's red/orange only in the anime. Also Obito/Kakashi's color is unknown, coloring not from Kishi.

It has nothing to do with how good/bad they are. Color of Susanoo corresponds to the user's chakra color.