I think fallout new vegas is a great game and has more to offer than fallout 3. Their are diffrences between new vegas and fallout 3, like karma never realy affects the outcome of the game,their are factions and you get to choose your side instead of having to stay with one group. Their are several differant endings to the game which will be affected by which faction you choose and what quests you complete,what followers you have met,and many other ways to affect the ending. There are only a few downsides like its hard to find power armor training but in fallout 3 its apart of the story,and once in a while weapons dont make a noise when used but other than that this game is great. I loved all the new weapons and companion wheel, it made it easier to keep my companions alive. This game is great and has really done some good for the fallout franchise.
Seriously just don't put too much emphasis on what these people who rate the game 6 and below are saying. They're being extremely bias based on any glitches they have experienced and load times, which is nowhere near a decent excuse to be rating a great game such as this so low.
Bottom line Fallout is Fallout and despite the glitches and bugs that can pop up the game is truly fantastic. The brand new story is a refreshing fresh start to the Fallout world and the map, although looking smaller, is absolutely filled with tons of cool places to explore and loot, while fighting your way through some of the same and some different and cool enemies, and creatures. The Fallout 3 storyline does beat out the storyline in New Vegas but the story is pretty good nonetheless.
As for other new content there are plenty of the same and new, cool weapons that you can find and use, many of which are very awesome guns. The modification system is also a very cool new add on which lets the player use a bit of strategy to how they want to approach different situations if they have the modification for it. Along the lines of guns, the whole aiming down the sight addition is awesome and really appeals to players like me who love their FPS games, it just adds so much fighting ability to this great game, besides having V.A.T.S. as a last resort.
The new companions are unique and all have their own stories behind them and quests to complete for them, something that is completely new from Fallout 3. The companion wheel allows you to interact with your companions like never before. You can adjust how close they follow you, how aggressive they are, and what weapons they attach. You can even attach Stimpacks to them, which they will use themselves to heal.
I would rate this game more along the lines of a 9.5, however there is no option to do so. Don't let talk of glitches and bugs discourage you. You will run into them and slow load times, but installing to your Xbox fixes this pretty good.