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New Vegas is the best overall Fallout game. Bite me.

One of the Kings of RPGS period. New Vegas is expansive and has so much to uncover. Here are some key tenets on its greatness:
1. Customization and play-styles: New Vegas has so many different ways to play the game that everyone will find a style that best suites them. Go guns blazing, talk your way out, sneak and hack through each mission, etc. What you can do in this game is only limited by the player's imagination and any style you pick will work with this game.
2. Choices: Numerous ways to tackle quests that play well into the players style. Numerous options also allows for tones of replay value.
3. World design: So many things to see and do in this game. So much so that you often won't find everything in one playthrough.
4. Replaybility: Biggest strength this game has is how much replay value it has. Honestly not many games have as much replaybility as New Vegas. First playthrough including base game and DLCs will have players easily putting up to or over 100 hours. And that's just one playthrough. All the different choices and playstyles makes this game endlessly replayable. More than get your money worth's.
Honestly there's so much to this game's greatness that you have to experience it yourself to understand why it's so beloved. Easily top 20 best games of all time no doubt. Pick it up for the holiday season you won't regret your stay in New Vegas!