I've just finished playing through:
Atomic Heart
DLC 1: Annihilation Instinct
DLC 2: Trapped in Limbo
DLC 3: Enchantment Under the Sea
I played the main game on release on gamepass and quite enjoyed it. When it came up for offer on the PlayStation store, I bagged a copy with the DLC content.
This game is far from perfect but I just really enjoy it. It's a weird and wonderful world and has some brilliant lore and story aspects.
It's pretty linear and that helps to keep my interest on track.
The main game is probably 6/10, but if like me you enjoy the world and the concept then it's easily an 8/10. Some issues include no sprint / run mechanic and clunky movement (especially annoying for boss fights),
DLC 1 was not so great. 4/10
DLC 2 was a total lolwut thing, but was actually one of the best things I have played in ages. Really enjoyed it! 8/10
DLC 3 was a return to normal game style and continued the story. Pretty good DLC compared to the first but I enjoyed it less than the 2nd

7/10
Looking forward to concluding the story with DLC 4, and I also hear there may be a 2nd game on the way too.