I thought the 6 Tailed-KM Naruto vs Pein animation was actually pretty awesome.
Susanoo is the cheapest, most overpowered jutsu in the entire series, and it totally ruined the 5 Kage vs Madara fight.
The animation has been total crap ever since the start of the war arc, not to mention the horrible pacing of each episode. It's more entertaining to just read the manga now.
Actually, the entirety of the War Arc has been horrible. None of the important supporting characters died, the hyped Seven Swordsman fights didn't amount to anything, and the Edo Akatsuki became way too underpowered. The Kinkaku Ginkaku fight ruined so much of the story it wasn't even funny: non-jinchuuriki gaining bjuu powers just by eating Kurama's intestines? Sage weapons that seal people when they say their most often used words? Sigh...
Neji's death was way too sudden and half-assed. It didn't have the impact it was supposed to, and really just ended up feeling like a set-up for Hinata's development.
The Juubi looks pathetic. It should have been something more badass, like a ten-tailed dragon, or really anything else for that matter.
Naruto passing around Kyuubi chakra freely sounds so far-fetched, and the one tailed cloaks look ridiculous on everyone.
Hinata's overall looks paired with her Byakugan eyes reminds of the Grudge and other creepy japanese ghost-women.
Onoki doesn't even look like he belongs in the Narutoverse. Neither does Akatsuchi (his right hand man).
Naruto looks way better without his headband on. OK, now i'm just nitpicking...