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.
Base Breaker: Alister. One half of the fandom find him intolerable, the other half adore him and were furious at his reduced role in Underworld. Oddly, Zip did not receive the same reaction, despite serving the exact same function as Alister, as everyone generally likes him.
Possibly due to simple personality preferences. Zip seems more laid-back and enthusiastic, while Alister tends to be fussier and a bit on the stuffy side, which can be taken as nagging.
Evil Is Sexy: Amanda goes through quite a wardrobe change in the period between her believed death and her reappearance in Kazakhstan. Gone are the cute shorts and blouses with flowery embroidery and in come the cleavage-baring tops and tight, preferably leather pants.
Stop Helping Me!: General consensus amongst the fandom seems to be that Zip and Alister's frequent comments ruin the feeling of isolation and provide too much help during puzzles, negating the feeling of accomplishment when you finally progress. They have their supporters though.