Starsiege/YMMV

Awesome Music: The in-game music may get your blood pumping, but the creepy, oppressive menu theme will make it run cold.
Demonic Spiders: Any Cybrid enemy has a chance to be this. Especially so with their heavier "warforms," to say nothing of the Platinum Guard.
Good Bad Bugs: Invisible vehicles, rainbow colored terrain, flying tanks... Getting a bug is nothing less than a blessing!
More Popular Spinoff: Starsiege: Tribes, to the point where its sequels dropped the Starsiege part from the title entirely.
Nightmare Fuel: The Cybrids, so much.
- "...human//animal child-forms strapped to war-form externals maximum limb-mobility, permits//enhances percentage of pilots who hesitate before firing."
- "Happiness is a buncha smokin' human steaks."
- "...Unit displays a fascination with using intense light to destroy human//animal retinal sensors..."
- The mugs of many Cybrid squadmates. Their names are no exception, either: Eats-Only-Heads, Plague-Dog, Bovine-Burning, Sepsis, Process-Canker...
  - Being a tank pilot staring down the business end of a HERC. Unless of course, the tank is approaching the HERC at speed.
That One Boss: Prometheus at the end of the human campaign. IT gets a custom and stupidly overpowered mech that has a random weaponset, which can easily be the overpowered alien tech. Winning is almost luck.