As someone who started DM'ing the module before reading
I, Strahd (at least 10 sessions worth before I read the book), I really appreciated the insight it provided and how it elucidated the relationship between Strahd, Barovia, and the citizens. I read through the module several times before running the game, and I kept coming back to the same question over and over again. Why is Strahd doing what he's doing? I didn't really understand the way the module set Strahd up. He seemed sooooo one-dimensional. To me at least, the module painted him as evil for evil's sake. Outside of wanting Ireena (and for as powerful a creature as he is, there's nothing stopping him from tearing through the PCs early on to get her at any time he wants) I couldn't understand why he was doing what he was doing. And I didn't feel satisfied with the idea that he just likes to toy with the PCs. So while I appreciate that the 5e Curse of Strahd may be a "spiritual reboot" or a different take on Strahd and Barovia, the way the module portrays Strahd and works him in as the antagonist is, I feel, the weakest aspect of Curse of Strahd. Of course, that is my take and how I read it. As you said,
@Charlaquin, either take is valid.