Reasons why FO: New Vegas is better than FO:3

This is my personal opinion anyway, feel free to comment below why you think the contrary.
So here we go.

The Brotherhood of Steel, everpresent in the Fallout Universe.

-First we have hardcore mode. A type of play that does not affect the difficulty of the game, it only adds realism to the game by adding factors such as dehydratation and sleep depravation to the list of things the player has to worry about. For gamers like me who want it though(no pun intended) this is a very welcomed feature.
Also it makes sure that food and water actually has a purpose in the game. In FO: 3 I just stacked hundreds of pounds of food in my fridge in megaton without ever using it.
This feature has a negative side too: if a body part gets crippled, the only way to heal is going to a medic or using a special item named doctor bag. This can be frustrating as if you ran out of doctor bags in the middle of a battle, you are screwed. Did I mention they are pretty rare?

-Better writting staff... In Fallout 3, a vault-dweller who spent all his life locked in a vault, messes up the whole capital wasteland by becoming in a couple of weeks the richest and most powerful entity in the wastes, just to find his father. Here you do have a higher purpose, driven in the beggining by revenge, you are manipulated by higher minds than you but you eventualy get to change the fate of the New Vegas and the Mojave wasteland.

-Then you have the faction mechanic. Comit a crime against a faction they will attack you, do a good deed, they will be nicer. Wear an armor belonging to a faction you will inherit both it's enemies and it's allies.
This mechanic makes you feel like part of something bigger and a you can really feel the presure between the factions in the Mojave.

-Gambling. Can't really say more. It's just a gimmick I consider to be cool and deserves to be mentioned.

These are not the reasons Fallout 3 sucks, only the reasons why Fallout NV is better. The developers really took this engine and the Fallout series one step beyond. The game is not perfect though. We have not yet forgotten the billions of bugs the game had at release, nor the invisible walls which are so many in the game, you just get incredibly pissed after a while but the developers seem to have learned from their mistakes and lets hope we'll have tons of DLC coming soon.