People consider Amaterasu as one of really powerful and strong jutsus out of there. But, there always needs to be an excuse. When did Amaterasu ever worked? I love Amaterasu as much as you do, because its really an awesome Eye Technique. But the fact that i've noticed, it never really worked. 1. Itachi used Amaterasu to escape Jiraiya's Frog Trap. It worked, but then it probably was sealed by Jiraiya, so it wouldnt work on this frog anymore, + it costed alot of Itachi's chakra. Second, it was used in Sasuke vs Itachi fight. Itachi didnt wanted to kill Sasuke i got it, but still it didnt even really worked on him. Third, when used on Madara. It made Madara Shout Loudly and all, but then it appeared that nothing happened to him. Fourth, on Killer Bee - Worst Amaterasu fail ever, no comment. I dont know that did he used it on Danzo, but if he did then it failed again. And so on, its a strong technique, that never works.