Good chapter. I actually like this so much more than the so-called war arc so far. Sure, it's cliché, and it's redundant to know their backstory considering what we already know, and it seems like a lame way to shoehorn in Ninja who maybe should have been showed more (Tobirama) and people who just shouldn't be shown at all (Izuna).
Still, Hashirama's flashback so far is much better than every single chapter in the war arc.
Although Hashirama's and Madara's relationship makes Sasuke's and Naruto's bonds seem...well...pathetic. Hashirama and Madara trained together, messed around and planned their future (he...he...heh...), while Naruto and Sasuke went on one mission together, took the Chunin Exams together and just hated one another. I would have prefered it if Naruto and Sasuke had this kind of relationship instead, considering they're main characters and the entire story is based on getting Sasuke back...