Welcome back to the wasteland. As the game starts out, you are brutally "murdered" by a cheeky fellow in a checkered suit with a pretty pearl .45. You wake up in a rundown town called Goodspring in their doctors house. (Yeah you weren't "murdered" but you were shot in the face). There are many mysteries and side quests that the player may complete as their leisure. They can run through the campaign or take their time doing every stinking side quest. You can literally spend DAYS playing this game, I know I have already clocked in over a week or two of play time. The game is about the same if you have played the first Fallout. You also don't need to have played the first Fallout to understand the story of this Fallout game, all though I think you should play it in my opinion. The story in that one is a wee bit better in my eyes.
Playability, the one world that should be present in any game ever created. You know why all those other crappy games went down onto the this game sucks big mansticks is because of playability. Call of Duty is such a good game because people can keep replaying it. The exact same thing with this game, you can first play as a good character, then replay as a bad character or a neutral character. Wipe out one faction save the other.
- Protip: Get a companion as fast as you can and carry anything of value, i.e. guns, armor, meds/drugs, or any other miscellaneous items you may find on your travels. You can really use those caps fast when you *SPOILER* buy lots of body implants that can greatly increase your stats. Each costs about 4K caps and the better ones can cost up to 8Kcaps! A good place to sell your crap is at the Gun Runners west of New Vegas, later on in the game they hold a fluffy 8K caps for you to sell stuff to.
Summary of my rant, the game is definitely a buy. The game has good mechanics, re-playability, thrill, story, and deep characterization. I only wish that in Hardmode, it wasn't so annoying with the amount of crap you are always having to deal with.