I disagree with your assessment of the game developer.
I have no idea if you're right about those games.
I agree that a Beta Ray Bill movie would be great. He's so agonizingly noble. How did things work out that we saw Rocket and Groot in a movie before Beta Ray Bill?
Keep in mind that development companies are like rivers. It may be the same river, but the actual water that flows through it today is not the same as the water of yesterday. The talent of yesterday is the overrated hack who's full of himself tomorrow.
Your enjoyment of the ME series though depends on how much stock you put in plot construction, because story is the only thing the games really have to offer. They never really got the 'game' part right.
Also it probably has something to do with the titles. 'Guardians of the galaxy' bam, put it on a shirt and it'll sell. 'Beta Ray Bill and the legendary sun-god-sword-thing?' ehhh sounds obscure and risky.