I am excluding Tactics, BoS, and Fallout 76 since they are either not part of the main series of single player rpgs or are canonically dubious.
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Nobody played the originals I guess, because they blow the Bethesda ones out of the water. Fallout 1 & 2 are in my book some of the best RPG's ever 3, 4 and NV are just hollow shells of what it once was.