Platinum End was among the biggest wastes of potential in the entire anime industry. It was messier and less interesting than most shows going and will end up as nothing but a huge waste of time if you decide to give it a try.
Platinum End Episode 24 wasn't as bad as it could have been and was quite good at points. However, this ending would not work for many people, which makes sense given what it was. However, this writer didn't mind it. It was leagues above some of what this show had already put out.
Platinum End Episode 23 was a boring penultimate episode for a show that didn't do anything particularly offensive. It was decent for what it was, but it didn't explain much and glossed over supposedly important information. Maybe that's what final episodes are for.
Platinum End Episode 22 was confusing, boring, and full of plot holes bigger than the ones on your average road. At this point, we can only hope the ending is swift and merciful.
Platinum End Episode 21 was a buffer episode that linked the current arc to its supposed final episodes. There was a lot to enjoy while complaining about the usual suspects. By all metrics, it was a typical episode of Platinum End.
Platinum End Episode 20 was intriguing, fascinating, and highly captivating. The show has turned its fortune around in this arc, and it's a shame that not many people are here to witness it these days.