In general there's nothing wrong with DS2 gameplay. Sure you can find some bad hitboxes here and there but it's relatively minor, but over all the games all play extremely similar to each other and each have fantastic gameplay.
It's the world design that really suffered in DS2. Whatever flaws DS2 might have had, they would have been easily forgiven by the fan base with better world design, just as they had been in DeS. The Souls games are about rigid gameplay and intrigue, intrigue which is communicated through world design. Bloodborne seems to have the design spark that DS2 lacked.
Just based off of what we've seen it looks to even surpass the previous games in some aspects. Although, I've already prepared myself for the complaints coming from people wishing there would be more environment variety in this game. The Souls games are casting a very large shadow and I'll be curious if the community will be able to take it for what it is. As much as I love a glorious Anor Londo reveal, there is something to crafting and mastering a cohesive singular world design that this game seems to be striving for.