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.
Porting Disaster: It's no one's fault, really (the Xbox, while being the most powerful console of its generation, was not fit to run something as meaty as the Source engine), but the quality of the Xbox version is simply too far away from the PC original to make it worth playing.
Then again, considering all the Drone Jam going on with the antlions and rebels, it's probably for the best that they were never combined.
Ugly Cute: The Antlions after you get the Bugbait, who follow you like eager puppies and attack anyone you tell them to. Before then, of course, they were pure High Octane Nightmare Fuel.