
I've never made a secret of my disdain for Halo. Glad you approve.
I was, and that's why yes, it was.
This question is pretty tricky for me, as I cannot really fathom a non-videogame universe _IN_ a videogame but then I guess that's what they said about a movie being made about TOYS(Transformers).
How about a Thundercats(Don't judge! It was one of my favorites as a kid) RPG? You play Lion-O(of course) and you get to have the supporting cast of Thundercats to take into combat. Kind of plays like an action RPG set in their sci-fi-ish uiverse and you get to pilot their Thunder Tank vehicle, which, now that I google it, kinda looks like the Mass Effect 1 vehicle on steroids...
...BRB, making a Thundercats mod/skin-pack for Mass Effect!