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.
YMMV: The Forever War
Ending Fatigue: Used to good effect, as Haldeman sets up the story such that the only way to end it is to force an ending. This reinforces the point that the war has gone on so long that people no longer have any idea why they're fighting or what they hope to accomplish.
Unfortunate Implications: Halderman's depiction of homosexuality in The Forever War is quite infamous for the amount of criticism it's attracted.