We've had polls like this one the forum since the beginning and the results are always the same. Fallout, Planescape, Fallout II and then a lot of Troika and Infinity games. Only difference between the new posters and oldies was that the mayority of the older ones actually knew and played stuff like Dark Sun: Shattered Lands, Realms of Arkania and Darklands. Nowadays most people don't go further back in their knowledge of rpg's than the late 90's or early 00's.
It's no big surprise really. Despite some dead ends (FMV interactive movies anyone?) gaming really was on a path of incremental improvement until about 2000, where new games built upon the features of the old, so it's only natural that the best games came towards the end of the period. Then the XBOX generation came and started the decline in full force, giving us the Dark Decade instead of the further incline we had been hoping for.
Really? My thoughts are that RPG's reached their pinnacle in 1992-3, the years of Ultima VI, Ultima VII, Serpent Isle, Wizardry VII, Darklands, Gates of Dawn, Blade of Destiny, the Ultima Underworlds, Might and Magic V & VI, Betrayal at Krondor, and the last of the SSI Savage Frontier.
1994 was the year of Ultima Pagan, which is symbolic for things that were about to go downhill. The late 90's and early 00's produced some good titles in my opinion, but they were made by dying companies and it was obvious.