Well, to tell the truth, it is more like a Sasuke Shippuuden than Naruto Shippuuden... as most of the story (EXcluding the fillers seasons) are centered around the story of Sasuke-Itachi and Sasuke-Naruto. Sasuke gets more action, spotlight and plot & character development compared to Naruto.
Sasuke has to endure learning the real painful truth about Itachi... all the while, he has come into contact with all the main villains of the show... name it... he was Orochimaru's student... then he created his own dangerous shinobi team... and even formed a pact with the Akatsuki for evil purposes. The Sasuke now is not the Sasuke we used to know before... after being away from Naruto and the rest of Konoha for so long, he has become more powerful and perhaps slightly arrogant… Besides that, the Sharingan also features heavily in the Sasuke-Itachi story as you will learn more about the Mangekyou Sharingan and the story behind it, most of which is a new and fresh tale regarding the Uchiha clan, naturally involving Uchiha Itachi as well. Moreover, Sasuke’s battles in Shippuuden steals the show effortlessly as he begins to show his new terrifying powers … the Sasuke-Itachi battle is definitely a must-watch. It kept my heart pounding as they keep using genjutsu (illusion) techniques and the Sharingan. Just awesome, the battle was.
Naruto’s adventure, on the other hand, dulls in comparison. Forget about the fillers and stuff, Naruto is still the same old, same old… hoping for Sasuke’s return, talking about bonds and friendship. Of course, Sasuke-Naruto is one of the favourites and a touching story but it gets frustrating when every time they try to locate Sasuke, they always fail to find him… and when they did find him, things start to get emotional (with the flashbacks and all) but Sasuke always manage to beat them and escape again and again. Naturally, Naruto gets disappointed and trains to get stronger than Sasuke… By the way, the 9 tails demon fox is also featured as the epitome of Naruto’s power, along with a newer and stronger Rasengan.
To sum it up in a few sentences: (Main points)
Mostly, Konoha is in danger of being destroyed.
Sasuke is the latest bad guy in addition to the current cast of villains.
Good people (from Konoha) and bad people (from Akatsuki) die in battle.
The tale behind Mangekyou Sharingan.
Kakashi and Jiraiya’s past revealed.
Naruto’s friends’ growth (Hinata, Sakura, Rock Lee, Neji and others from Konoha's ninja teams have improved plenty. Gaara as well, he had his own story arc in the beginning episodes).
Sasuke’s own team… Hebi/Taka… dangerous ninjas hand-picked by Sasuke to form his own team for the purpose of revenge.
Myterious Akatsuki members.
All in all, Naruto Shippuuden is very enjoyable as all the characters we love are back in bigger, better ways, stronger and cooler-looking even... if not for the slow pacing and mountains of fillers, it definitely would have attracted all the old Naruto fans back.
