Also, I get that Walpknut doesn't want to read more, if the user says that FoNV non-linear approch is lazy writing. As the game allow you to expand all backstories and people goals to make his opinion, and could follow many different story arcs means that the writers had a lot more work to do. Wheter you like that or not is another issue, but there is a lot more work.
On a more personnal note, i think the opposite. Fallout 3 writting seems to me a lot more lazy than Fo1, Fo2, FoNV and even FoT. The story is straitforward and don't allow much choices. Those few choices don't seem to matter much, outside the area those choices are given. Beside that, the backstory and depht are lacking in much areas, characters and factions. This is not much on its own and definitaly not enough for a game that pretend to be an RPG.