The things you just mentioned last literally less than a minute each. To compare to Novac, which has a lot of interesting dialogue with an ex-ranger (who gives an unmarked quest), a singer on the run, Boone's starter quest (which is awesome), the crazy old man, the ex-Enclave pilot, and the vendor who sells the t-rexes. Novac has a lot more going on, and that's not even including the Come Fly With Me quest. Another point you'll notice is that everything I've mentioned is actually well written and ranges from amusing (Cliff Briscoe and his t-rexes), to depressing (the ex ranger and his quest), to enraging (Boone's quest). Did anything invoke even remotely similar emotion in Fallout 3? No.
To quote the fellow above you, apart from Boone's quest,
Do those quests have any impact on the ending or the gameworld? Right, they don't. Just another checkbox that gets filled and 100XP. The end.
Now, I don't think this matters myself, but you lot seem to think that only quests that get referenced in the end-game slides are of any worth, so presumably Boone aside, Novac's a waste of time too. Me, I liked it, I thought it had character, but then I liked Rivet City too and seem to be operating to a completely different set of criteria here. I'm quite happy to concede that the writing is of a higher stndard in NV, though, I've no argument there, but I suppose that's less of a deal-breaker for me. I don't play videogames for the quality of writing, y'know?
Anyway, there are plenty of quests in NV that have no impact on the gameworld where one would expect they should, like 'That Lucky Old Sun', 'Booted' and 'Cold, Cold Heart'.