I completed Fallout New Vegas yesterday. Let me say its Good but not bad, its bad but not terrible. here's the thing, in Fallout 3 you had freedom even before they made it so you could continue to play after the battle at project purity. The New Vegas quests seem to all be tied into the main quest there's very view free quests. In Fallout 3 you could roam the wastes completing quests and not even worry about the main quest. Think about it, Nuka Cola challenge, Big town, Aerafu, all were fun quests meant for your enjoyment but didn't have anything to do with the main quest. One could argue that Children of the Atom doesn't have anything to do with the main quest except Daddy being proud/disappointed with you. In New Vegas the main quest is in your face the whole time. Sometimes it seemed like work with little or no fun. I wish they could take the Game play enhancements from New Vegas and put them into Fallout 3.
Your last sentence. That's what I wish. I want the companions and the companion wheel, the foraging for plants, all the extra guns and stuff, I want to cook food, and make ammo and I want my actions to have an impact, but not every-single-thing I do...all in Fallout 3. Or maybe a new game with the best of both worlds.
I think some people just prefer one game over the other. FNV and F3 mixed up together would be awesome.
I quickly got bored running along the limited number of highways and roads in FNV. I'd run cross country and over hills trying to get somewhere and kept running into invisible walls in FNV. And what are all those empty areas on the map that I can't get to? The DC Wasteland feels more vast. Not every single place in the DC Wasteland has a marker. It's more of a discovery even if you get the perk that shows all the map markers. I don't mind that there are not more people. I'm there to shoot creatures...mutants, raiders, radscorpions, ants, mercenaries, ghouls, etc.
I like the characters just fine, but it's not a big thing for me because I normally get attached to a handful and then I'm fine. I get tired of so many characters yakking at me endlessly and wanting things done and jumping from map marker to map marker talking to even more people. I suppose I could just shoot them, but then I would feel bad. I do feel that the dialog for the F3 characters is limited, not just the voices, but their responses, the dialog needs to change after you've done certain things in the game. Your actions should affect their response.
I think I just prefer more randomness with my storyline. I guess I don't need a fully cohesive storyline from start to finish in order for the game to be enjoyable. I like wandering off the beaten path or highway as the case may be.
I am not fond of the way they set up the Strip. Why isn't there a marker for the casinos? I would love to be able to travel to the Lucky 38 and go directly to my room rather than having to go through three doors to get there. So annoying and pointless.
So in conclusion there are things I like about both games and things I don't like about both games.