In keeping with the culinary metaphor tradition of NMA...
I ate a really tasty burger once. It was a perfect burger. Then, a year later I ate a new burger. It tasted almost the same, but was a bit too heavy on mayonnaise.
Then, years later, I learned that a third burger was being made! It looked different and was made with a different kind of meat and bread, but essentially, it was the same burger and everything looked as if the burger was like the first burger I ate.
Then, the burger joint went bankrupt. I was sad.
Years later, a hot dog company bought the burger recipe. They've made their own version, but instead of making a burger, they made a hot dog, because they weren't good at making burgers. The hot dog was decent, but only the smell was left of that burger I loved.
Then a different company was hired to make a new hot dog in the vein of the burger I loved. Now, it's still a hot dog, but it smells, tastes and feels like that burger I loved.
At this point, instead of crying about the burgers long lost, I decided to love the new hot dog that tastes and smells like the burger I loved.
tl;dr: Fallout New Vegas is the closest thing we're going to get to a proper Fallout 1/2 sequel. Plus, it's being done by people who know how to design games and know their Fallout (even if some consider their design choices controversial).
