Dead Frontier/YMMV

Demonic Spiders: Red Longarms in the 2D version. Going melee with them is asking for it. In the 3D version, the Bone and the Tendril. He is fast and can take a decent part of damage (including several grenades and a few clips of assault rifle) before dying and is pretty large. She can One-Hit Kill a player with a low endurance even with an armor in perfect state and full health and has a decent range. They're ALWAYS escorted by a crapload of regular zombies who run at you like there's no tomorrow. And the deeper you go in the city, the more often they come to say hi...
- The new Spider zombie is a literal example.
Goddamn Bats: Goddamn birds will wait until the very moment you open the chat prompt to descend en masse like something out of a Wagner opera.
Tier-Induced Scrappy: Shotguns. Despite requiring a substantial amount of strength to wield and being, well, SHOTGUNS, they're indisputably the worst weapons in the game, being surpassed by equivalent handguns in almost every department.
- Rescued from the Scrappy Heap: Shotguns again. In the new 3D update, shotguns are now no longer useless, as pistol and rifle damage has been nerfed, and knockback and hitstun have been nerfed for every weapon EXCEPT shotguns.
- The roleplay classes are seen as this. They have no useful skill or bonus except gaining more XP