There were some previous productions as Ultramarines: A Warhammer 40k Movie and The Lord Inquisitor. The first one was met with disappointment or lukewarm applause, the second one while looking amazing way too much time to deliver.
As for the new Astartes series, it really sets a new benchmark for the future company’s productions. This the first time the Warhammer space marines are shown as actual tactical, reasonable soldiers but not just walking tanks shouting “For the Emperor!”.
In Astartes, there’s no single word, no speeches about Primarchs and Emperor and heretics. The movie is straight to the action. No more words. You just have to see it!