YMMV / Unturned

• Demonic Spiders:
  • Flamer zombies. If one of those is in a mob, you can toss the idea of saving ammo by melee right out the window, as they explode in a huge fireball when killed, and if any regular zombie is caught in the blast, it'll become a Flamer as well.
  • Wolves. They're tiny and don't have much health, but they're exceptionally fast (capable of outrunning a player going fast on a bicycle), attack just as fast and are Immune to Flinching. The worst thing about them by far, however, is their tendency to shove their heads inside the player's hitbox, so it's impossible to headshot one that's already attacking you unless you can leap on a ladder and away from it. They also deal a surprisingly large amount of damage to vehicles.
• Nightmare Fuel:
  • The game can get a bit uneasy at night but just as surprisingly worse during daytime.
  • Those damn zombies that crawl on the ground can cause some players to have a good Jump Scare from time to time, and the flanker zombies even more so. The former is not helped by the fact that crawlers inflict and survive the most damage out of any non-special zombie type.
  • Those low growls emitting from the zombies and the fact that you're exploring nothing but wilderness or abandoned buildings doesn't make it pleasant either. In fact, most of the time one would be constantly and very nervously be watching their back throughout their surroundings when starting a session.
  • The fact that the zombies are virtually relentless on their chases. As soon as they see or detect your presence, you better get a good start since they'll hunt for you in good fair distances... And it gets even worse when a full moon comes up in the 3.0 version and later. Zombies have deeper growls, actually pretty scary glowing red eyes, detect you from a much bigger distance and deal a lot more damage. What makes those eyes worse is that you can actually see them in the distance, and, sometimes, a zombie might have their back turned to you, only to turn around with those eyes glowing and scaring the shit out of you because you weren't perfectly silent on approach.
  • Mega Zombies. Imagine a hulking beast that can resist multiple shotgun blasts, machine gun fire, and just about anything you throw at him, including whole cars, which he can also swat away without an afterthought, and you have a Mega Zombie. Even worse is that, from afar, they actually look quite similar to a regular zombie, making the possible encounters with them even more terrifying.
• Paranoia Fuel:
  • Experienced bandits. Imagine that you're in a group, and that you're just walking down the street, shooting zombies in a city and looting houses. All is well, and then your buddy's head explodes and their body hits the ground. You didn't even hear a gunshot, just the wet smack of the bullet entering his head. You take cover inside of a house, and realize that you have no idea where that guy is or if he has a bead on your head at the moment.
  • Seeing another survivor who simply runs away. Are they alerting their friends? Are they baiting you into a trap? Are they just spooked? You can't tell until the bullets start flying.
  • Creeping through a bunch of zombies in a town when you have no weaponry. It's already hard to fight one zombie with just fists^* unless you have Overkill maxed out on Normal difficulty, whereas your fists hit hard enough to stun zombies, and that'll alert more as you kite it. Slowly making your way through the horde, as they moan, groan, and shamble about, is a tense matter. Gets even worse on Hard mode, since zombies are Immune to Flinching and the only way to reliably dispatch them in melee is with a chainsaw or a jackhammer, both of which are extremely loud and capable of alerting zombies in a three-block radius.
• Quicksand Box: You start with absolutely nothing and in the wilderness, consider yourself lucky if you can see some landmark, and the game world is filled with random junk and enemies who will easily splatter you. You know you need supplies and weapons to survive, but good luck figuring out where to get those. It can be equally as bad, if not worse, if cosmetic effects are enabled.
• Ragtag Bunch of Misfits: A lot of starting multiplayer player bands will most likely look like this, especially if they are all wearing different clothing and equipment. It becomes less apparent as they get better gear, however, with experienced groups wearing military or spec ops clothing.
• Scrappy Mechanic: Drinks have to be cleaned with purification tablets. There's no way to restore them to a potable state like filter or boil them. This forces players to never get too far from a town with a drugstore, or give up at least eight inventory slots to lug around a generator and a jerrycan to activate drinks machines for soda cans (and the occasional bottles). It used to not be too much of a problem, as certain foods also restore thirst, but with the update that impedes players from eating when their hunger bar is full and diminish the results if the food restores more than necessary to fill the bar to 100%, it's a bigger problem. The "More Farming" Game Mod mitigates this a bit with the craftable Charcoal, but it's only usable on the Dirty Water item that can only be obtained by fishing with the mod's own fishing rod, which takes up enough materials to not be an early-game craft.
• Ugly Cute: As characteristic of the semi-cartoonish blocky style, most of the player-made characters and zombies can come off as this, along with the animals.