I'm enjoying Edo a lot, but... it's huge! Places to sell/browse items are now split between the first Edo town map (I guess? The bazaar scene there is still kinda empty/all over the place) and Echigo, which is a pain to run all the way back to even after you finish the story and open all the gates. I guess this will get better as more people trickle into higher areas, but the annoyance of the bazaar system is really sinking in since this update. The content of Edo is nice, but the layout of the town is just bad compared to something like Kaga with a central area and branches to dungeons coming off of it.
Some of the bosses definitely have too much health. It's not that they're unmanageable, it just takes.. a very long time. The toudaiki boss and lightning wanyuudo come to mind especially. And like Annie said, with any reason to carry people gone, they should give lower levels a boost to exp, similar to the way you get a 100% exp boost as a new character now.