Platinum end is a bizarre manga, and an interesting failure.

Story (3/10): The plot of platinum end starts out as a death game/sentai parody. It's an exaggerated action manga that is played mostly serious. It has its moments but ultimately just feels over the top in its set pieces and gore, with a cast bizarre side characters who don't last very long. They aren't entertaining and some are just unpleasant to read about, namely the 'ugly' guy and the 'disease' girl.

However half way through there is a direction change, and the plot becomes more of a slow paced political thriller with some moral and philosophical arguments. During this time it becomes fairly boring and is a series of confrontations that lead to nothing. After the entire series builds up to a certain event it finishes off with a weak anti-climax and one of the worst endings I've ever seen in a manga in the very last chapter. Some unanswered questions remain so I wonder if the ending was rushed because of declining sales.

Art (9/10): Obata seems to have put some of his best work in his whole career in Platinum end, and that's saying something considering his track record. In the first half of the series the panel style is similar to in Bakuman, with a lot of creative panel shapes and dramatic drawings. At points it is overwhelming and confusing to look at. After the direction change half way through, the panels become more straight and the art less dramatic, it kind of loses it's steam, but still is excellent throughout.

Character (3/10): The characters are extremely weak. The protagonist is very annoying with his refusal to give up his ideals in the beginning. He 'develops' into a boring, passive shell of a character. The heroine of the series and main love interest isn't interesting either and is basically a non-entity after her character arc at the start. Many other characters appear but usually only briefly and are pretty one note. The two main antagonists of the series are weak as well. The first is stereotypical and the second is one-note and boring. Neither of them have motivations that make much sense.

Enjoyment (2/10): This is the preachiest series I have ever read. Multiple times characters will go on long rants about moral or philosophical arguments. But what is conveyed isn't deep or interesting. The themes are basically outright told to the reader multiple times, but they aren't even good. You might think that a manga with lots of moral and philosophical arguments would be interesting, but it's obvious the author doesn't understand the arguments and just reads like someone talking to themselves while missing the whole point. This series is just a massive slog that thinks it is far more intelligent than it actually is.