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.
The. Fucking. Zombies. They're a newbie trap in every way. Getting sandwiched between two is certain death.
The Agent Mk0's will dodge all your attacks unless you fire fast enough and will fire at you in small squads, easily decimating your Tac-Bar.
Riot Cops are even worse, and they have even longer Tac-Bars, so if you're running a gun build then pick your poison: wasting ammunition on copious amounts of nothing, or lots and lots of frustrating pistol whipping.
The GOL3M units can only be defeated by knocking their mask off with a melee attack then firing at their exposed heads until their faces crack and die. And that's only the regular ones. The worst are the special red and black ones, which carry miniguns as standard issue and to get to their heads first, you have to hit them hard enough to crack their mask open, then shoot them-which can take a very long time.
HSQ: Will have you literally saying "holy shit," especially later ones.
Visual Effects of Awesome: Krinkels spent half a year working on the first minute or so of Abrogation, and good lord does it show.