Bethesda did "post-nuclear" way more convincingly than Interplay. That's not just the difference in graphics or perspective talking. Survival seems harder in FO3. I can't remember how many times I've wiped out dozens of foes at once in the original games. And that's before power armor, super-stims, pancor jackhammer, party members and so on. Once you hit a certain point, no Raider base, Deathclaw pack, Mutant army or Enclave outpost can stop you. In FO3, even at lvl 20, if I try to fight 2 or 3 deathclaws at once I could easily die unless I make the right moves. Even so, between each mini-battle I often have to heal or fix my gear. The threat of radiation is also more evident. The feelings of being disconnected, alone and desperate are more evident.
Sorry. I disagree with everything you said.
Survival seems harder in FO3.
Fallout 3 is not hard. At all. The game holds the players hands in so many ways. Once people realize that, the game stops being scary, challenging, or fun. And I'm not just comparing it to the previous Fallouts, but to other FPS's and RPGs.
Supplies (Drugs, Stimpaks, Food, Water, Ammo, Weapons, Caps, Books, Armor, etc) These can be found everywhere and in great abundance. These were a lot more scarce in the previous Fallouts, and also a lot more expensive.
Weightless Ammo - Sorry. But being able to carry 10,000 bullets for each gun and 10-20 mini-nukes throws "wasteland survival" out the window.
Weightless Meds - See above.
Weak enemies. Bad AI. Low health. And the ability to land successive headshots at low levels, make everything in the wastes non-threatening.
Threat of Radiation more evident? More evident since you can see exactly how many rads you have on your pip boy now. But that actually makes it less threatening since you can see how much it'll take before you hit the next radiation level. Even then, the negative effects aren't that bad. On the off-chance that you get highly irradiated, don't fret, Rad-Away and Rad-X are in high supply. Pop a couple, or take a trip to your nearest doctor to have them all removed. Radiation is a lot easier to manage than in the previous games.
Sure, if you powergame in the previous Fallouts, you'll become unstoppable. But to get that point, you had to go through hell.
In Fallout 3, you're unstoppable from the moment you're born.
As for a convincing post-nuclear setting? Don't forget to take into account the attitudes of both games. Compare how NPC's in both games talk. One game greets you and showers you with all the love and assistance that you need. The other game takes your caps and guns you down for no apparent reason. Not to mention the abundance of six, drugs, and slavery in FO1 & 2, which are all viewed as part of everyday life. As opposed to FO3's black and white wasteland. Noble heroes, dastardly villains, and innocent townsfolk. Sounds more like medieval fantasy than post-apocalyptic.
Sorry for all that. I guess I was bothered by what you said.