I've had a couple of ideas kicking around in my head I'd like to offer as unsolicited advice:
NV is a great game, but doesn't quite hit it out of the ballpark. As is customary, I blame the publisher for not giving Obsidian enough money/time. Specifically, the 2 problems I see are
a) Too many filler quests, not enough substantial quests
b) A related and thus a greater problem, the plot isn't that good. The initial stuff with
is interesting but then it just goes into a rival factions competition, which isn't a story as much as a device. To make matters worse, a lot of the main story quests don't really have anything to do with the story. Those should've been sidequests, while the main story quests should've actually advanced the story in a meaningful way. It seems to me with all the good writers Obsidian has they should be able to come up with a better plot, or hire a book writer for the plot if all else fails.