Amaterasu is overrated. It has been countered by Raikage, Nagato, Gaara, Kankuro, Jiriaya, Kabuto, Tobi and Sasuke himself. Its supposed to burn for 7 day and 7 night yet it was not burning when Konoha made it to the battle site of Itachi vs. Sasuke. It was raining at the time so it obviously just went out.
Also its supposed to be as hot as the sun yet it took a considerable time to even burn through Karin's shirt, didn't make it through the samurai armor, did absolutely nothing to Gaara's sand or the toads stomach and wasn't even close to damaging the Raikage's gauntlet.
If you believe the hype it is a very strong jutsu, but there are many examples in the manga that disprove a lot of its hype. It couldn't even kill fodder samurai that had no role in the story at all.......