These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Shaggy Dog Story: All but two humans are dead. Only one other character is still alive (and he was introduced late into the game, which explains it all, really). The bad guys are powerful enough to basically conquer the rest of the galaxy by force if they wanted to, so even assuming that the galactic senate-or-whatever actually has the balls to rebel against a race they all previously thought of as Benevolent Precursors over the recent accusation of xenocide against a race that's already two people away from completely extinct, the whole story is a case of The Bad Guy Wins, and your remaining hope for even a Bittersweet Ending is systematically and cruelly crushed in such a way that it's almost comical. So unless the sequel-that-never-was was planning on some kind of Set Right What Once Went Wrong or bringing all of humanity back from the dead (somehow), it's pretty pitifully pointless.