Hmm...well, I thought it was a little short and it didn't progress the story as much as I would've liked.
HOWEVER....the content was really interesting for me and it opened up room for loads of new theories.
I'm definitely excited to see how the rest of that battle plays out, and how exactly both of them survived.
Like many others, I'm definitely drawing a parallel with Naruto and Sasuke here. So at the end of the Hashi/Mada battle, I'm expecting one of them to beaten and defenseless, totally vulnerable....yet the other one doesn't kill them. If that does happen, most people would assume that Hashi won and refused to kill Madara (but I'm not so sure. Maybe I just fancy the idea of Madara winning, but not being able to follow through with killing Hashi. Meh.).
Anyway, if it does turn out the way that most people expect, wouldn't it be quite the surprise to find out that Hashi helped stage Mada's death or something like that? xd
Overall: 5/5 (It would've been a 4/5 due to the length, but the irresistible adorableness of young Mada bumped it up a point.)