Fallout: New Vegas - I'm not a huge fan of the delayed health regain system. I tend to be the type that downs a lot of food and drink on the fly as I'm fighting to regain health in both Fallout 3 and 4 so it needs to be instantaneous. Unfortunately in New Vegas every food and drink has a "cool down" period after you consume it before it gives you health. Kind of annoying. On the flip side of this, I have to rethink my strategies to combat so in some ways it's kind of a mixed bag of annoyance and refreshing. It was just a little off putting to begin with.