Modded NV a bit, lots of quests mods. Mostly bounties. New Vegas Bounties I, II, III. The Inheritance. Headhunting. The North Road. The Depths of Depravity. Headhunter. The Collector. All of these are great, though NVBIII has problems by the climax.
Other quest mods didn't grab me as much. A Difference of Opinion, New Vegas Stories, Fortune Canyon, A simple Package Delivery, Sweet Home, The High Desert, Boom to the Moon, and fucking Autumn Leaves - meh to ugh. Might try out the New Reno stuff. See, what I think it is, is that modders are some creative people, but finding something that complements or adds to New Vegas is hard. All those above mods barely fit New Vegas for one reason or another. Added too many new factions, big ideals, or whatever. Or languished for too long, or the tone was just too off. The High Desert has you make a new brothel-inn in Primm, then shoves you into a religious commune-cult, cursing all the while. Eh. But Bounty Huntin'? That's easy. It's combat, with some lore, maybe some choices, some fucked up set up. Voice Acting goes a long way too, but it's easy to find something that works with just killin' folk than musing on something bigger. Treasure huntin' might be good, too, but what treasure is worth it to a level 50 Courier already with high end weapon mods and damage mods and 300,000 caps?
Mods that expanded the wildlife and so on almost always tacked on some BS I didn't care for. A World of Pain, I remember, did not have a huge Underground Faction thing going on before, but now it does, and I hate feature creep like this. I just wanted more shit to shoot or come across that felt organic/natural to be there. A huge underground city and a faction of tech raiders doesn't fit that. Faction Reloaded mods were the same. Legion, Followers, Raiders would bloat too much. Radio mods were fun. Radio Mayak, Radio Ghosts, Radio Indigo, Combined Syndicates of America, Conelrad, Surf Radio, Pacific West, OWB Expanded, People's Radio of China....
There might be some house mods that add quests, but I dunno. I liked a little hotel mod for the courier and that was it. No bullshit mods about the Enclave, Brotherhood or Steel, or whatever, either. I killed the Enclave in 2 and the BoS got killed by their own stupidity by 2 and I sent the rest of them packing in NV, but nooo. Everyone loves the goddamn Brotherhood of Steel or wants to bring back the fucking Enclave. I would get it if the Enclave was supposed to be like, the whole sum of Post-War America's government, but they were a bunch of deluded asswipes on a rig and Navarro. Dead and gone, stop trying to shove them into everything.
But hey, there's always new New Vegas mods at least. I finished another house ending, but my character is beefy and when another good quest mod comes along, I'll reuse 'em. Or just need something to shoot. Maybe I can try TTW...?