The Expanse. Good story, decent effects, Thomas Jane. I just binged the first season and I'm ready for more. MORE! Watch it now.

Fringe is probably my favorite Sci-Fi series of all time.
Battlestar Galactica is great
Black Mirror is aruguably the best thing on netflix
The Twilight Zone is unquestionably amazing
Firefly of course if you're a Joss fan
Star Trek and TNG
Orphan Black is just great, only seen season 1 and 2 though
Farscape (heard only good things about it)

That looks pretty cool. Thanks.

Star Trek TNG and Battlestar Galactica are my favourite Sci-Fi series'.

I'm also looking forward to Roadside Picnic which starts this year. Based on the same source material as the film 'Stalker'.

I just read the synopsis for Roadside Picnic. It sounds so familiar. It's possible I read the story long, long ago. It does sound intriguing.

Also if you love "hard sci fi" then The Expanse doesn't necessarily fit. It might be close but there are some "shut your brain off and enjoy" moments. Didn't ruin it for me.

Honorary mention of Star Trek:Deep Space 9. Started off a bit slow (similar to TNG) but picked up pretty well, just doesn't get enough press.

Dark Matter on Netflix is also pretty good. Has sort of a Firefly feel to it.