Binged S4 at the weekend. Vastly improved over previous series imo. Series 1 sucked frankly, 2 was ok, 3 showed some potential, and finally with 4 and a decent budget it's a pretty good show.
Vastly better acting talent available with the Amazon budget, Murtry and Wei were excellent supporting characters and really delivered that whole story arc. Nagata's painfully bad performances were mercifully limited. Pretty boy Holden spent less time doing his Dawson's Creek act and was OK. Best of all, we finally got rid of Miller. Amos has become a decent character now instead of the walking cliche meathead.
Looking forward to S5 now.
Everyone's entitled to their own opinion, but what you've disliked is what made the show great -
Miller was awesome, a link into the protomolecule
Amos - he had some form of surgery (I think) which removed feelings etc, so his character was spot on.
Holden was terrible terrible this season and a waste of his cpatain/team lead skills, bad decision after bad decision.
And season 4 was sub par compared to the previous seasons.