Fallout 3, have the super mutants and Enclave as main enemies, water and geck are important for the main quest.
Fallout 1, super mutants are the main enemy and water is the important main quest.
Fallout 2, Enclave is the main enemy and geck is the important main quest.
Fallout 1, start as a vault born.
Fallout 3, start as a vault born.
Fallout 1, super mutants are the main enemy and water is the important main quest.
Fallout 2, Enclave is the main enemy and geck is the important main quest.
Fallout 1, start as a vault born.
Fallout 3, start as a vault born.
Actually, I think this is a succinct summary of where and why FO3 went completely wrong from a lore point of view. Its like the guys that wrote the FO3 storyline picked up random plot elements and dropped them into FO3 without any regard for context or plausibility. But, because they were using classic 'fallout' tropes, it must be fallout, right?
E.g. the supermutants are basically Oblivion orcs dropped into the fallout world, and nothing like the original version found in fallout. The BoS are basically paladins dropped into the fallout world, and completely nonsenical vs. the original lore. The water purifier plot is just stupid. The geck is a complete afterthought, where they basically decided to reuse the word without it meaning anything.
FNV on the other hand, feels authentically fallout; the various factions are more or less what you'd expect (though the whole thing with Caesar's legion is a bit of a stretch, granted). But beyond that, FNV plays with the morality of your choices much more than FO3 did; there is no 'good' faction (I suspect that the NCR would have been even more ambiguous if Obisidian were allowed free rein, as its quite clear that this faction has been shoehorned into the 'good' concept but even then with a lot of grey areas if you poke around and talk to various characters in game).
Having said all that, don't get me wrong - I really enjoyed FO3 (particularly modded up with FWE) and it was a great dungeon crawler (in these sense of having lots of stuff to explore underground or in abandoned buildings etc). However it doesn't hold a light to FNV story-wise.