The problem seems to be that it was trying to make you the hero, but it couldn't because than the story makes no sense.
Not to mention that guardians are made out be literally unkillable. Which generates a heck of a lot more issues.
And add that to the fact that nothing the story says you do can possibly have any effect on the actual game, even if it should.
But yeah. I'm not dissapointed, but the story was less then I was hoping for.