Significant improvements in New Vegas over Fallout 3 or Oblivion IMHO:
- The damage threshold system - a great way to bring more depth into combat while keeping it simple. I'm not sure how applicable it would be in TES.
- Less (scavenging) is more: less desks, drawing cupboards and trash bins that you're kind of forced to check through, because 40 - 60% of time there's ammo or caps in there. This results so that easily around 50% of the time spent in dungeons consists of checking containers. The "[EMPTY]" marker helps a little, but New Vegas' way of simply removing most containers is better. FO3 style scavenging is downtime, and FO3 has so insanely lots of game content that what's left after removing that downtime is well enough and more! Actually this problem doesn't exist in Oblivion, because with almost all of the crates and such you know for sure that there is nothing interesting in them. Only certain kinds of containers are worth checking out, and whenever there's something of value to be found, it's kind of presented clearly. While not realistic, IMHO it was nonetheless a very good design choice so hopefully they'll bring that back.
- Placement of creatures in the world. NV critters tend to come in groups, and spawn in places where they make sense, while in both FO3 and Oblivion critters would spawn in seemingly random spots and usually just a single critter per spawn. Also, creatures like coyotes and bighormers being basically hostile but passive as long as you keep your distance was very nice, and believable too.
- Nice crafting system. Well, the user interface for campfires, workbenches and reloading benches left a lot to be desired, but the system itself was good.
- No spoiling game balance with free services. I mean the home upgrades in FO3: infirmary and the chem lab thingy. There were doctor's services and meds to be bought, but since you'd get rad & addiction removal, limb fixing and healing for free at home, this game aspect became redundant. (Link in sig to a mod to fix this... )
Anything else? Thoughts, opinions?