I guess Fallout 4 might be good (hopefully Bethesda takes some pages from Obsidian's book there). I was disappointed by Fallout 3, but Fallout New Vegas wa sa pleasant experience... then again, it had a different development team. Fallout 2 remains my favorite in the series overall (while F1 had a more coherent world and plot, F2 was just larger I guess, and the first fallout game I played).