Fallout new vegas my all time top game and here are the reasons in no particular order:

Pros:
Hardcore mode
Unique weapons
Most of the DLC depending on what you like
Feels like a RPG
Tons of customisation in terms of builds armor weapons.
Every "start" of this game can be something completely different
The limited but interesting amount of enemies
Can kill anyone

Cons (name me a game without cons?):
Glitches lots of them some save breaking so save often!
There is a main quest that i really dislike but can be bypassed (without mods thankfully)
Difficulty doesn't effect XP gain
The gear you spawn with (couriers stash) i wish i could turn of or say "i dont want this gear" as it doesn't feel immersive to me starting with all that good gear.


Overall, my opinion my be slightly byst no denying that, but 95% overall steam reviews as of 30/06/2017, doesn't prove that i might be wrong that this is one of the BEST RPG's of all time.