I prefer a poor shooter to a combat system that is so bad, it may turn newcomers against turn-based combat forever.
Gameplay is criterium #1, so I shouldn't even like the original Fallouts, but I do.
I suppose what the originals have in their favour is that they are hard, for WRPGs, but the hard mostly comes from random rolls that are fatal. Just reload.
Real challenge, not so much.
The only real strategy is to follow NPC directions early on, so you'll go pass through the easier areas first, building your PC for mobility and APs along the way.
The only real FO1 tactic is to look for corners, then move around corner, shoot baddies, retrace steps, end turn, repeat.
In FO2 you can also defeat some strong melee critters, by attacking and moving out of range in one turn. It's all about AGI.
What's left is a great setting, good atmosphere, nice dialogue and some C&C.
The amount of freedom you had and the way the game reacted to your choices set the bar for RPGs at the time, but it has been surpaced since in that area by games like Arcanum.
So Fallout 3: copies most of the setting, retains some atmosphere, bad dialogue and some shallow black-or-white game consequences. Add a crappy lineair plot. Combat improves from terrible to poor.
The difference between the old and new, in short then is the difference between a badly damaged masterpiece and a mediocre derivative work.
That is CRPG land in a nutshell.