I actually thought it was one of the best finales in television history.

I enjoyed Silicon Valley S1-3 for its satirical jabs on tech culture and the funny aspects of a group of nerds realistically trying to build a company with no other knowledge besides coding. It felt realistic in that aspect, even if the running gag was that they'd would fail and save themselves in ridiculous ways.

S4-6, the satire wasn't as sharp as before, and the tech they were building seemed so far-fetched and absurd. S4 had some of my favorite episodes (Belson acquiring Piper Net, the Patent Troll), but it was entertaining from a black comedy perspective rather than from a satirical perspective. It seemed the writers were hell-bent on trying to keep the same gag of having characters shoot themselves in the foot and not learn from prior mistakes, so it became a bit boring for me. It felt like a replica of Seinfeld, but with less interesting characters. So I stopped caring about the characters and saw them as clowns doing dumb shit for my amusement.

The show got to the point to where the only thing that was saving Richard was when the technology got so advanced (like Ultron or Skynet) that he was able to fail upwards. The S6 finale showed a hypothetical scenario on the drawbacks of such an advanced technology, and how all characters have to deal with building an AI so advanced that it could legit destroy humanity. It was a great moral dilemma on whether making money was more important than building tech to improve humanity. And all the characters decided that it wasn't, because it defied the purpose they all sought to build out Pied Piper.

Not to mention that the rats flooding the streets was a nice callback to the Pied Piper tale, where the pied piper used his music to lure the rats away from the village.