In many ways, I feel like Fallout 3 was the "beta", and Fallout: New Vegas is the game we should have gotten two years ago. Fallout 3 was a good game, it just wasn't what it should have been.
You're selling it extremely short. I'm not sure how you're managing to do that. Fallout 3 was the beta, and New Vegas is the game we should have gotten? Think of Fallout 3 in terms of design alone, none of that would exist without the creative vision of Bethesda Softworks and the design team's obvious skill in revamping old elements, and introducing entirely new elements. Creative choices of what to keep, what to introduce, what to lose were all on the nose.
From the Vaults to the alternate timeline architecture, new creatures, an epic list of weapons all fully realised and consistent with the world. For exploration alone Fallout 3 is outstanding. If it had been made by anyone else we'd be seeing something totally different. I'm not gonna turn my nose up at quests in FO3 like retrieving the dish to get GNR running, because it is a fetch quest, or the story is bit flimsy (I don't think it is). I'll praise it for taking me across a mutant infested Mall and into a museum in which I experience a tour of a Vault the character I'm playing grew up in, and which achieves success in expanding on the world and lore by introducing alternate histories in the display cases and exhibits. Repeat this one example across the entire Capital Wasteland in varying forms and you have yourself a Fallout experience.
Think of every aspect of Fallout 3, if you played it and explored everything, it is VAST! I haven't even touched on elements such as VATS, and the combat system, all the creative genius of Bethesda. Then introduce the support from Beth for the modding community. You weren't entitled to anything, and certainly not a New Vegas instead of a Fallout 3... Vegas would not, could not exist without 3. I dare say many of the elements introduced to Vegas, would have been there if Beth were still at the helm, most of them were obvious, and a great many were listed by the community, too. It seems like a natural progression of the franchise from 3's launching pad, to me, not a 'way FO3 should have been'.
Edit: Instead of four years on the whole thing, Bethesda given two years to write and build a game using existing elements, would have produced something eerily similar to New Vegas. IMO