This could possibly be the best episode of Naruto Shippuden. For the first time in years, I was fanboying over a Naruto episode...
The animation was nothing short of phenomenal; you could see the amount of detail in the facial expressions and mannerisms of the rather terrified-- and rightfully so --people in the Shinobi alliance. It's why I believe this episode did an even better job than the manga at showing how truly fearsome the legendary Uchiha is. Seeing the Shinobi Alliance's reaction was just absolutely priceless. I'm also extremely glad that they gave Madara time to showcase his Taijutsu and Kenjutsu prowess, those hand-to-hand sequences were the highlight of the episode.
Though, I was irked by two things: #1 being the peculiarly premature reveal of the Rinnegan; it was an obvious slip-up, and I think it took away from the shock value, but then again, Madara having the Rinnegan is already spoiled in both the Opening and the preview seen in last week's episode... so it's really not much of a big deal in the end. And #2 being the fact that the episode felt kind of quiet for the most part. I can't really explain it, but I think they could've done a much better job with the soundtracks in this episode.
A definite 5/5; I'm currently watching it for like, the 15th time and I'm nowhere near tired of it.