Jean-Luc Botbyl’s review published on Letterboxd:
By the time Split was entering its final act, it was losing me. And while it did successfully keep me paying attention until the final moments, it was running on fumes by the time it got there. For the most part, it was the performances keeping me engaged.
The plot is interesting enough, sure. The problem is that it feels bloated. It's interspersed with a number of exposition dumps that distract from the main goings-on. I could see myself loving a version of this film that was 20-30 minutes shorter, with a tighter script.
Anyways, I referenced the performances, and I guess this is the part where I heap praise on the film. McAvoy's performance in particular generated a lot of buzz, and it's well deserved. He delivers on all fronts, capturing each of Kevin's distinct personalities.
Less talked about is Anya Taylor-Joy, who, once again, delivers a phenomenal performance. Her character requires a lot more subtleties, and she captures those absolutely beautifully. Between this and The Witch, I stand by my stance that she's an actress that could have a huge breakthrough any minute now.
Haley Lu Richardson and Jessica Sula do excellent jobs as well. They don't have nearly as much screen time as McAvoy or Taylor-Joy, but they use it incredibly well.
Unfortunately, I had kind of had the last scene spoiled for before seeing the film, which kind of colors the whole thing. I'm not in love with it, to be honest. If anything, it removes some of the impact of the film, though I can see why the implications could be exciting going forward.
Split's pretty good. It's a long shot from great, and I'm not sure I have any desire to watch it again. In fact, I don't imagine that I would be able to make it through the film a second time. A shame too, because it ultimately does a disservice to the cast.