You know - I'm a very big fan of the original games, but to be quite honest I don't think they're the sort of games that I'd without reservation recommend to anyone and everyone. Even for that time period, there was a very specific demographic they were aiming those games at, and I don't think it's necessarily to everyone's tastes. I do think that, even if you aren't a fan of those specific gameplay conventions and their manifestations, that there really is a lot for a RPG fan to like, at it's core. There are some very fundamentally "pure" roleplaying concepts being played out in those games. But it really is a matter of how much you're willing to play the rest of the game to get to the real "meat" of the epic roleplaying experience that is Fallout 1 and 2.
Because no matter what, I think a game still has to stand on it's own as
a game, as an overall gestalt. If you don't like the combat, or how your explore the world, or the interface (or let's be fair, the graphics really are starting to show their age at this point,) then I can only imagine it would be quite a struggle to power through all of that just to get to the chewy nougat that is the interactivity and "immersiveness" of the world put forth there.
I think there's a lot to love, there, about the original games. I think even now there's a lot that pretty much
all the major RPG companies could learn from Interplay's approach. As a monument to that epic goal, I think Fallout 1 and 2 are very noteworthy. As a game, however, it comes down to how much fun you're going to have with it. And that's something that I don't necessarily think is going to quite cut it, for a lot of people. I'd say that it's probably worth the money to check it out, if you have some spare money lying around - but I also wouldn't particularly say that everyone who's played Fallout 3 owes it to themselves to play the originals. Because there's probably a lot you may have liked about #3 that doesn't really have any relevance in the previous games. They're both RPGs, but they represent rather different approaches towards that common goal.