I just finished playing New Vegas over the christmas since I think I'd be disappointed by F4 in its current state and it was the first time I played through all the DLC. I honestly think it is some of the best stuff that came out in last gen, Lonesome Road couldn't be better if it had tits and was on fire. I think the "Bethesda RPG" lends itself rather well to more isolated experiences since the start of your power curve is the most interesting and you have to improvise and compromise, instead of applying the exact same approach you did a hundred times before. Once you hit the plateau, it gets rather boring.
Any words on F4 DLC so far ? I presume they started selling some sort of expansion pass ?