I mean I am not talking award winning here. It is a video game from 1998. Whose original intent was to be Dawn of War, with Space Marines, Tyranid, and Eldar.
And what they changed it to is by no means a 'new' story. Creator aliens try to perfect life in some never-ending cycle. Someone disagrees that there should be a cycle. All powerful creator aliens get wrecked. Stuff happens, children races grow up and fight one another. Some are bigger picture than others, one is actually enslaved by the big bad and needs to get liberated to help save the universe. Big bad dies to the 'chosen' one.
Honestly, a lot of this was probably derived from Warhammer lore, and painted differently to avoid legal issues.
It needed to be simple enough for children to be able to get what was going on. When they made the latest installments that are in an age where storytelling in games is (usually) much improved, they did what they could. You can't really destroy the old story without alienating your hardcore fans who grew up on it and now had oodles of disposable income. You gotta lean into it and make the best of what story there was.
So yeah. Decent enough to make millions upon millions of dollars. Not something I would call bad at any rate. Certainly not amazing either.