Dunwich is, as it always was, a deeply satisfying play experience. Often held up as “the original and the best” campaign, with its emphasis on time pressure (don’t take too long on any one scenario, or the subsequent ones get harder), and there is a genuine sense of potential total failure – you can simply crash out of this campaign having failed to save humanity. It is VERY Lovecraftian, and as a huge fan of the books and the classic Sandy Peterson RPG, this feels entirely authentic… but equally, it may put off some as you may want setback for failure rather than having to do the etch-a-sketch hard reset.
The revised Investigators don’t really add masses to the game beyond some new decks to play with: the characters are relatively mid-tier and don’t really enhance or alter existing game mechanics; to put it another way, you can readily just play the campaign box with your core set. I personally would like to have seen the Investigator box really lean into teaching the deck-building side of the game, but equally not making it essential makes the purchasing decisions easier. As a campaign box, though, it’s a great buy as your next step: more variety and more narrative without adding further complexity.