Glass (2019) - 3/10 (Really disliked it)
I liked Unbreakable and thought that Split was OK, but this was a bore. There's hardly any story, just lots and lots of exposition and superhero meta to pass the time. The movie feels very aware of the superhero genre, as Shyamalan includes just about every superhero concept (weaknesses, hero/villain symmetry, troubled upbringing, origin stories, etc.) in a way that feels like fan service.
The majority of the film takes place at a mental institution where a psychiatrist tries to convince the men that they're not really superheroes. It's about as exciting as that sounds. For some reason, Anya Taylor-Joy's character, the girl who was kidnapped and tormented by McAvoy's character in the last movie, now cares about him and visits him regularly. Willis' and Jackson's characters have little to do and are upstaged by McAvoy's... not that the latter has much to do, either, but the film revels (perhaps a little too much) in McAvoy's impressive abilities to change personalities on a dime. I'm sure that Shyamalan was thinking, "Those parts of Split were praised, so let's do it even more this time." Finally, we expect a major showdown, but the ending amounts to little and feels like a pathetic conclusion for the characters.
I think that the script was rushed after the success of Split only two years earlier and exemplifies much of the half-baked writing that Shyamalan tends to take flak for. He's very hit or miss, and after appearing to return to form, he went right back to a miss, IMO. I imagine that superhero fans might be more tolerant, but I'm not one of those.
Edit: One more thought...
I liked Unbreakable because it was a thriller that you realized only at the end was a superhero movie. Similarly, Split was a horror movie that you realized only at the end was a villain movie. This movie presents itself as a superhero/villain movie from the beginning and in every scene, so it's very different and I think that that's part of why I found it less appealing... though not being my cup of tea doesn't negate my criticisms about it being written poorly and being boring.