You can get upgrades to your weapons and armor that actually make a difference, and enemies and yourself go down fast with bullets. Guns can get jammed and flashlights need batteries which again are small details but add to the immersive experience.
Skills are enjoyable to level up, giving you a sense of progression and getting stronger. The nice thing is you'll have to decide whether to carry a few extra rations or that gun you found, but there are plenty of each to find in the wasteland. But do not fear, these mechanics are not annoying and do not get in the way of enjoyment, they only supplement it. So, the game succeeds in the survival department, adding Thirst, Hunger and Sleep mechanics.
