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.
That One Level: 9:2 is just sadistic, and not in a fun way but a boring way. It consists of endless, incredibly slow swimming, with occasional attempts to destroy gun turrets that are pure luck whether you destroy the turret or it shoots you. And you only have one soldier so if he gets killed you have to start the phase again from the start. It's hard to imagine anyone playing it again once they've finally managed to win it.