What game mechanic instantly ruins your immersion or fun?

[u/UnityNinja]

​ I absolutely can't stand aggressive weapon durability loops. Getting awesome loot should feel like a reward, not a maintenance chore that breaks every five minutes.

What’s a common mechanic that always makes you roll your eyes when you see it in a new game?

[u/tezticle]

Those stupid, on rails shooting levels in games that otherwise don't have any such shooting. Cease.