Yeah, Itachi is by far Kishimoto's work at its best. Best written character in the Manga, in my opinion, and to be honest, i think Kishimoto intended it to be that way. His story started, culminated and ended perfectly. Probably the only character, from the beginning to the end, that was developed nigh-flawlessly. It's seriously not easy to pull of a perfect death, then revive the same character, and give him an also equally perfect end.
Itachi is undoubtedly a big part of the reason why i'll remember this Manga with good, despite how it's currently going ("bad" is an understatement), and probably won't rate it below a 7/10. Creativity and originality, a.k.a Itachi Uchiha.