New Vegas is actually leaps and bounds ahead of FO3 in terms of its usage of stats. You see, there's a difference between just displaying numbers on the screen and actually making them affect gameplay, and Fallout 3 did the former while New Vegas does the latter.
Fallout 3 is also literally railroaded, there are too many hard blocks in terms of where you can walk and WHEN. New Vegas is far more of an open-world game, and even original Fallout maintains a convincing illusion of free travel.
And in order to have a Fallout "theme" you gotta do more than give a million monkeys with typewriters some 50s music and pipboy images and hope that they'll output something coherent, because in case of FO3 it clearly didn't work.