I guess for people who loved DOS2 this is a dream come true, but for the rest of us, not so much.
For me its the opposite DOS was fine but I could have never get that involved as in past D&D games. I even finished Temple of Elemental Evil which was rather bland but I did not finish DOS2 yet (have it planned but played Kingmaker and Dwarf Fortress instead).
For me it makes a difference if I have a party consisting of Fighter, Rogue, Cleric and Wizard and some known gods, locations, a rich history and I can cast my Dimension Door to flee from that Beholder, Drow or other iconic enemies.
They can make D&D games for the next 10+ years.
