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.
Crack Pairing: Subverted, While Garrus / Kasumi seems like a Crack Pairing at first glance, due to the latter's minimal screentime in canon, Razor's Edge goes a long way in showing how much chemistry the two of them actually have.
It is relentlessly lampshaded how much of an Odd Couple they are though.
Citadel also showed that Mordin did indeed leave a recorded message for Shepard after his death.
In Razor's Edge Shepard gets help from Jack to control his biotic abilities, cue Mass Effect 3 and Jack is now teaching biotics.
Like You Would Really Do It: Averted. People were genuinely wondering whether Shepard was actually going to betray Mordin. Thankfully he doesn't.
But played straight with the "death" of Shepard, who was shown to be alive in the very next chapter.
In Dark Witness, readers were pretty nervous over whether Tali's critical injuries in the second-to-last chapter would kill her or not. Given that the story was written and completed long before Tali was even confirmed to be in the third game (and then post-release interviews with select Bioware writers in 2012 revealed Tali really did almost get cut from the squad roster!), people had good reason to worry.