Slower? I tried to speedrun PoE once and because of a build mistake in Chapter 2 Act 3 it took me 14 hours to beat the base game before maps. Terrible time, but still.
That might be nice, it would be cool to have coherent independent stories instead of: "There is literally only one path and this random person who means nothing to you or your mission personally is in your way, kill them! (reading their pocket journal is optional)"
I do feel like the second chapter was better than the first in that regard, though.
I spent way way way too many hours playing D2. Path of Exile is a great choice to fill that gap. Just do homework for a little bit before diving in if you give it a shot. Leveling builds and def use a guide.