I have read Summa Technologiae and everything is in there. And I mean everything. I have yet to see any new horizons for humanity he hasn't covered back in the sixties.
For me the single most distressing idea is that we might want to limit the speed of research in order to be able to integrate it, because the exponential growth would otherwise beat humanity's ability to adapt, leading to very turbulent situations.
Try to read this as Chinese literature and not apply Western standards. TBP is not about individual people but civilizations. Similarly, if you read Tale of Genji expecting a plot, you will be disappointed. But that doesn't mean it will be forgotten in 10 years.
Interestingly, I see a lot of parallels between Liu and Thomas Hardy. They both wrote sweeping tales that use individuals to represent abstract ideas. So, it's not just an Eastern thing.
Also, If I'm in the mood for hard sci-fi, I'll read Peter Watts who is (again) on a different league. Blindsight and Echopraxia navigate similar (but not only!) themes to TBP in a much more intelligent, thought-provoking and cohesive way.
This is an honest question as someone who is seriously considering reading TBP in near future.
If you're dead-set on reading it, read the first book and if you don't like it cut your losses short right there. I say skip the whole mess and read Watts instead.
The translation doesn't help, but the issues with the books go beyond it. It's obvious that Cixin Liu is not a good writer. The characters in TBP are cardboard cutouts and his pacing and framing of ideas awful. I feel that there is merit in his imagination but it'd be better presented in a different format than science fiction.
To truly see how bad he is as a writer, compare him to the greats:
Stanislaw Lem, Gene Wolfe, Iain Banks (Culture Series), Strugatsky brothers, Kurt Vonnegut, Robert Heinlein, J.G. Ballard, Ursula Le Guin, William Gibson ...
Since Dune was mentioned in this thread, I find the first two books to be absolutely in a different league than TBP as they're complex socio-political SciFi masterpieces that have stood the test of time. I've read Dune more than 9-10 times already (as I've read and re-read most of the books by the greats I previously mentioned). Can you imagine doing that with any of the TBP books?