Feel free to vote before reading on and letting my opinion bias you one way or the other...
Personally, my introduction to Fallout was through Fallout 3. I like a lot of the improvements of New Vegas in terms of gameplay, and occasionally, I found the dialog a bit more snappy, but there were some things that felt like major changes to the setting to me that went without explanation. I can't get into too many examples without veering into spoiler territory, but let's just say for instance that FO3 made a big deal about the rarity of coherent supermutants, and New Vegas introduces some like it's something the player would already know is relatively common. It's just one of a number of things that made me ask: Is this a thing from earlier Fallout games that the player base was expected to know? As such, I personally felt like Fallout 3 felt like it stood more capably an introduction to the series, and New Vegas felt like something that expected you not only to have played its immediate predecessor, but even more games before that.
