Both Fallout and Fallout 2 are great games.  (And Tactics is even OK if you accept that it just follows a different design philosophy than 1-2...and give everyone on your Tactics squad sniper rifles.)  I was initially sort of sad to see Fallout basically turn into "Elder Scrolls with guns" starting with Fallout 3, but Bethesda's take on the franchise actually ended up being OK as well.

If you like "classic Fallout" and are looking for more games like it, then I would very highly recommend Underrail.  It's very similar to Fallout but even more massive.  I hear that the Wasteland series is good too (Fallout was sort of a spiritual successor to Wasteland 1), but I haven't played through any of the Wasteland games yet so can't say for sure how similar they are to Fallout.