The second Fallout is pretty much the same game as the first one. It’s the same interface, the same gameplay mechanics, the same world (but shifted a bit to the north) and it had the same graphics and sounds. In many ways it feels like a massive add-on or extension instead of a really new game.
But coming out of the first game craving more of the same, I was overjoyed to get it. If you liked the first one, it’s hard not the like the second one. It was bigger and had more content than the first and no time limit. Exploring it was as much fun as the first game. I think the plot of the first one was a bit more concise and compelling, but the second one had more interesting places to go. Subjectively speaking I prefer the first one, but the second is just as good.