Hahahaha, this is too true. Bobbie is also terrible. But Avasarala I thought was really well cast.
But in general it felt like we got straight-to-dvd type D-level actors (think about crappy movies like The Human Race) in a B+ level setting (writing, CGI, set design etc). I was really confused at first as to whether this was a serious series with a relatively big budget for science fiction, or something that evolved out of a college film project.
Never really knew what to think. Like, I enjoyed Miller as a character. But I also cringe everytime I see his fedora. It feels like they do a lot of the hard things right, but somehow go out of their way to mess up some of the easy things.
Jane - yes, agreed. Excellent choice. Alex, Amos, Naomi are all good too.
The acting of several lead actors is really bad. Avasarala (the "undersecretary"), Bobbie (the "marine"), Jim Holden - they all portray characters in a way that is utterly unconvincing. Every scene with Avasarala is a scene that can't end quick enough. She looks like a bad impostor. Bobbie is miscast so severely it's on par with the "bitchy teenager" Anakin from Ep2 and Ep3. Holden's facial expression for determination is that of a man about to cry. In fact, he looks like his dog just died in most of the scenes.
The story and the universe is excellent, the rest of the cast is really good, but it's not enough to balance it all out.