I feel the need of modern shows to "stay off the cliche" or "go for the most unpredictable ending" is getting tiring.
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I don't think the overall construction of the ending was bad. Of course, there's an imaginative element to the realism portrayed in the computer side of things. But this isn't nothing new in the TV show, if anything maybe it was the only thing consistent throughout the seasons.
But just because the structure was good doesn't means the ending was - like an arrow throwed with good technique but bad precision to the target.
The ending was waay to melancholic. This was really better than Pied Piper ending as another Hooli? Sometimes, I miss the "fairy tales endings" - although predictable, they were better than "risk everything or go for nothing" endings.
Another bad point imo was the way they teased us with Erlich coming back. But guess what? It was Jian Yang all along. Nah. He was an important part of the story (despite the *sshole he was or is in real life), and many people were still atached to his character.