In my opinion, the things that Fallout did better than Wasteland was de-emphasize tech cults.
The Guardians of the Old Order were a massive farce that just never struck me as comprehending the technology they were hoarding. It was well and good that they'd venerate billboards and stop signs, but people capable of maintaining power armor should have had a slightly more balanced head on their shoulders. The order felt much "righter" when retooled into the Brotherhood of Steel.
There was also that random nuclear power plant cult in Vegas which had much the same iffy feeling. On the one hand they understood the big names and possibly some theory, on the other they clearly knew so little as to deify nuclear energy, how the hell did they keep the thing from melting down?
This the fallout IP handled a bit better as well, we had the Follower of the Apocalypse that didn't have their heads up their collective asses and were a stronger presence because of it, and then those kooky guys in Megaton in F03 worshipping a live warhead for the comedy value.
PS. I absolutely loved the Old World Blues DLC, it completely hammed up science and brought things to a Wasteland level of batsh*t without relying on post apocalypse cults.
PPS. Yes, Fallout had the Master and his cult, but it was still more plausible. You have oozing green vats, people go in, muties go out. You didn't need to understand it, the Master did, just sit back and worship.
Anyway, just my two cents. Discussion?