I guess arc being good or bad depends on your expections(not talking about high expectations or low expectations, I'm talking about content of wano)
I expected wano to be a major buildup for final arc both in SHs strength and buildup towards endgame, so I think flashback's contents were exact on point i.e. showing us the way to ultimate treasure than an emotional flashback, of course it was emotional but it was more focused on ultimate plots. it has matched my expectation about content so far and I love it.
on the other hand, you guys may have expected wano to be an complete arc with every aspects that makes arc awesome in itself.
I wouldnt mind having other aspects as well, in fact I would love it, but i also like wano as it is