The Dark Forest is awful. I hated everything about it from start to finish, but the next one is quite good.
DF actually felt like it was written by a completely different person but I see that it was a different translator than the 1st and 3rd books so maybe that’s it. Regardless, the events of DF are ridiculous and stupid.
Books 1 and 3 were good. Book 2 was laughably bad.