I played through Fallout 1.5 a few times back in 2018.
It's very, very true to Fallout. Subconsciously, it's almost frustrating because it showed that's it is possible to make a good Fallout game in the present-day.
There's a lot of people making excuses for the sequels to Fallout 2, and NV's shortcomings, and then Fallout 1.5 comes along as if Fallout 2 had been the most recent game produced.
The bittersweet victories, the haunting, hollow moribund world, small enlightened factions clinging to the last scraps of civilization. A thematically-realistic world in which no-body gives you something for nothing, or expects anything. The continuation of characters from Fallout 1. The sense that everything is about to sunset on humanity. It's perfect, and I never thought we would get anything this good.
A.T.O.M. RPG is also fun as the 'Russian Fallout.'