For me, the first Fallouts are harder. I can't set the difficulty past normal, and I still die really often, which is why fighting always feels interesting. Only thing there isn't any survival in those games, but how there could be? And there, stats of my characters meant something.
In Fallout 3, there is some survival elements, but not so many there should and could be. Like, no need to fulfill any humane needs, like hunger and need to sleep. Then, you can carry infinite amounts of stimulants that repair every problem, even middle of combat. Then, there seldom is enough enemies, they could not be killed in couple of short V.A.T.S sessions.
EDIT: As the for enemies, to be as godlike myself in previous games, I had to play for reaaally long, and I don't think I have achieved that level yet. In Fallout 2, for example, it is pain even seeing a Enclave trooper. I agree that with long enough gameplay, they would be easy. But in Fallout 3, Enclave or any enemy is not even worth of attention after 5-6 hours of active playing.
yes, i use the optional aspects Bethesda has included to make the gameplay suit the difficulty level i want.
you use the optional content to make the game easier (i have an ubergod as well) and i use it to make the game harder.
So, it is a solution? I should do make it harder to myself, when the game makers don't?