Agreed about the Halo lore. As a sci-fi obsessed, lore hungry kid growing up in the early 2000’s, Halo was my third pillar of formative space opera (the other two being Star Wars and Stargate). I loved the gameplay for those games, but I was also all-in on the stories of them.
It always weirded me out hearing games journalists talk about the Halo story being overly complicated and incomprehensible. Like I get not liking it if that kind of military sci-fi isn’t your thing, but I never felt the plot in those games was particularly hard to follow.