I can't imagine calling fallout 1 better in any capacity. Its short, simple, and doesn't really have any moments that really stood out to me. I remember getting to the end of the game and having to double take because I was sure that couldn't have been all of it, because there was barely anything there. To say fallout 2 doesn't have themes is just erroneous, and I honestly think the enclave is one of the best framed villains of the franchise. Their execution isn't as iconic, but they don't have to be, its not what makes them great. The enclave is the ultimate evil of the wasteland. They are the group that decided that the world should go to war, and in their greed they decided they were too important to die so they sacrificed the people of their country, then had the gall to say they are the true americans. They are the insanity of the prewar, and a huge theme of fallout 2 is the the brutality of the wasteland is favorable to the insanity of the prewar. Everything in the game is building up this sense that we should love the wasteland and hate this prewar group that is trying to take that from us. I'd say its a better told theme (and a more interesting theme) than fallout 1's theme of the world being broken and the master trying to save the world from it. The enclave is also satirical, which appeals to me on a level of complexity much more than the master saying "well I'm just trying to save everybody". Even his claims of "one race is the only way to stop us from fighting" doesn't really mean anything when you can have people in rwanda who judge each other by the thickness of the bridges of each other's noses and have an entire genocide based on that, even if they are all one race. Are the enclave sympathetic? No, they are supposed to be unforgivable, but thats why they are based on something real. They are American Unilateralism, they are unchecked nationalist elitism, they are the gap between politicians and constituents, they are bigotry in the name of american values. They are the unholy unity of aristocracy, politicians, and military elite, and its truly amazing how this game made 20 years ago still resonates with politics of today.
Fallout 2 even has really solid subplots. I love how the game has you following the path of destruction laid waste by the spread of jet, seeing all the lives torn by it and seeing how it cripples the wasteland. I love the hypocritical nature of Vault City and trying to argue with myself over whether they provide something critical to the wasteland or if they deserve to be destroyed to give way to something better. Do you sit idly by and allow slavery and classism to rule a world before you? There are no good powerful factions in fallout 2, because it has this theme that power corrupts. Power is what took a perfectly good world and tempted the nature of humans into war that destroyed everything. Thats why you don't align with factions in the game, and in a way, you make your own faction of sorts. I love the way that the towns are interconnected via different plotlines and quests that overlap between towns. It always made me question and wonder about the intentions of different groups so I would know exactly why they were there.
Fallout 2 impresses me with writing, and it manages both comedy and cerebral content really well, and that keeps me entertained. Fallout 1 tries, but I don't find it to have that many moments that strike me as requiring real thought.