I'm a little late to this discussion but I LOVE me some Fallout.
Fallout New Vegas is my favorite, but I really am a sucker for Fallout 3 because I grew up in DC/Maryland area.
Fallout 4 has a lot of things going for it, but everything about the game in my opinion is "meh". its good, I have fun when I play it and it looks BEAUTIFUL. But other than that it doesn't do anything for me.