First off, the actors all do a phenomenal job and really nail it. I've been a huge fan of Kumail Nanjiani ever since he voiced Prismo in Adventure Time, fans will be happy to know he brings his usual air of charm to this as well.
As a whole, it's really engaging and well made. The pacing of the first episode is a bit rushed, while some shows take 2 hours of content and turn it into 6 episodes, the first episode could've been extended to two. Otherwise the pacing is pretty great and the writing is well done for a biopic.
For a biopic. Unfortunately, it falls into some traps that every biopic does. It does that thing where the main character has a moment of inspiration that you know didn't happen in real life, and various other things for dramatic effect.
Normally that's fine, but the thing is that the way it actually happened in real life was even weirder and probably would've been more entertaining.
On top of that, where I take issue with it is with Paul Snider and Dorothy Stratten. While everything else is harmless, in reality Paul and Dorothy were much more tragic characters. The show makes Paul a more empathetic character, but.... I'd urge people to read their story Paul was more monstrous than the show makes him out to be and I actually think it does the audience a disservice to act like they can't handle it.