I'm only going to touch on the RPG stuff in this post, since that's what I know the most about without having to go Google diving.
Wizardry has the distinction of actually being possible to finish. There's no endgame in Oubliette. And, as 1up points out, it was one of the first RPGs to hit Japan and influence developers there (though I think The Black Pearl would be more deserving if we're looking at influence on Japanese development.)
Fallout showed that traditional RPGs could be viable. There were almost no RPGs of note between 1994 and 1997. Three years may not sound like much, but remember that the industry seemed to measure time in dog years at that point - it was a long, long drought. And immediately after Fallout saw massive success, there were tons and tons of RPGs put into development, peaking with no fewer than a dozen major RPGs in both 2000 and 2001.
Ultima III instead of IV? Really? What with pretty much every WRPG these days including some sort of alignment system, I think Ultima IV's karma system is one of the most lasting legacies of that series. Ultima III really wasn't much more than an incremental improvement on the previous two games in the series.
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