Firefly IMDb 8.9/10 - only 1 season.
My rating 10/10 for cast and cast chemistry, story wise it's rather dull but the cast made it enjoyable, so overall 7.7 or 8
Serenity IMDb 7.8/10 - Movie to bring Firefly to a closure, despite fans demanding Firefly to continue.
My rating 7/10 , the Firefly series was way better than the movie. But it's decent.
The Expanse IMDb 8.5 , still watching, so far i like the various Indian elements in a sifi set-up.. it never looked out of place and actually added to improve the viewing experience.
I'm on sifi bing watch these days, before this i watched a few movies, not the usual like Interstellar and Dune, already watched them a few times, but rather the low profile or the few that went under the radar. Open to recommendations