"Ocean's 8": Too cool?

The George Clooney "Ocean's" movies were marked by the coolness of Clooney and Brad Pitt, two guys who were as unflappable as they were criminal, whom we enjoyed watching not only for their style and their capers but because, in the amoral world they inhabited, there were still people worse than they were (Andy Garcia, for one, Al Pacino for another).
"Ocean's 8" gets the first part of that formula. Sandra Bullock and Cate Blanchett are themselves cool, albeit with a key tonal difference from the male-led "Ocean's." It never seems that Clooney et al. need the money from their crimes; they're just by nature rule-benders. The women of "Ocean's 8" cut corners because they have to -- because that's their main path to fortune; they're more working-class than their male predecessors, since as the movie often argues crime is no different from the rest of the world in its favoring men. Bullock's character -- the sister of Clooney's -- is getting out of prison as the movie begins while the man whose misdeeds put her there has gotten off scot free.
The film also has a nifty scheme at its core, the theft of a lavish necklace via the Met Gala, and I have been a sucker for a good caper movie since seeing "Topkapi" when I was 12. The "Ocean's 8" screenwriters, Gary Ross (who also directed) and Olivia Milch, know their capers, too, and trust that the plan for thievery is good enough, and their characters sympathetic enough, that they do not need a villain (aside from society generally). Just a nice haul for the end.
So there are virtues to the film, in the plan and in the performances; besides Bullock and Blanchett, the cast includes Helena Bonham Carter, Anne Hathaway, Mindy Kaling, Akwafina, Sarah Paulson and Rihanna. But there's a twist near the end that is less so because it's a late answer to a question anyone paying attention to the movie will have asked long before. Another plot point has pretty much been given away in the film's promotion.
And the absence of a major villain reduces the tension in the game -- as well as reducing the satisfaction that came when the "Ocean's" men had outwitted a rival.
So here's where I ended up: "Ocean's 8" was admirable, but less enjoyable than I hoped. When it's making the TV rounds, I will likely stop to see a good scene here or there, but I don't know if I will sit through the whole thing -- except maybe to double-check whether they played fair with the plot.