Since Sasuke's take down Deidara as well as Itachi, two renowned Akatsuki members, and then the other Kages, Neji doesn't stand a chance. Period. Yes, he is skilled and the most talented among the Hyuuga Clan, but then again so is Sasuke with his respective clan. It doesn't help that Neji gets very little screen time (both anime/manga wise). He didn't really do much fighting against Kisame, who only had used a 3rd of his power if I am correct. I'm curious to how strong Anko and Kabuto, seeing that she's currently in pursuit of him. It's revealed that she was trained/used by Orochimaru, but he did end up teaching her a numerous amount of forbidden techniques. ;) And then there's Kabuto with his strange obsession with dead bodies(personally I think it's necrophilia).
EDIT: It was only a 10th of his power