Experience all the sights and sounds of fabulous New Vegas, brought to you by Vault-Tec, America's First Choice in Post Nuclear Simulation. Explore the treacherous wastes of the Great Southwest from the safety and comfort of your very own vault: Meet new people, confront terrifying creatures, and arm yourself with the latest high-tech weaponry as you make a name for yourself on a thrilling new journey across the Mojave wasteland.
Interesting plot
The return of the companion system is great specially making their related quests.
Better developed environment compared to FO3.
The Karma and reputation being separated makes the player decisions more simple when facing relationship and moral issues.
Hardcore mode for the win.
Weapons, lots and lots of them.
Consistent fluff with previous FO games, unlike FO3 (eg. NCR expansionism and BoS being the dicks they always were).
Combat armor is awesome once again.