I think it really captured the "human element" of Star Trek. The conversations and the way people interacted with each other was on-point. I feel like the writers were able to bring back the TNG characters in a way that felt appropriate both to who they were and who they might have become in the following decades.
However, there really wasn't much to chew on in the sci-fi department, to the point I really wouldn't say it was even science fiction but a people-driven drama that happened to be set in space. I can understand why some people would've been thrown off by that.