IDK I fired up FO3 after playing NV a couple years ago and found myself enraged by the bullets moving at the speed of nerf darts. Had to install a mod to fix it. (And that kind of fucked the game balance.)
Admission time: While I enjoyed FO3 very much on the first playthrough, I did use the Wanderer’s Edition mod (or whatever it was called) for most subsequent playthroughs. It makes the combat more lethal and changes the game balance deliberately, but also it feels like guns actually have a real bite to them.