I think new and better graphics are a way to make games more interesting, likewise is more game complexity in general, developers just have a larger toolset to create the experience they are aiming for. Sure I have nostalgic memories of classic games, but if 20 years ago I would have played GTA: San Andreas, Half-Life 2, Mario 64, Oblivion, etc it would have knocked me off my feet! Dungeon Master from 1987 offered an impressive experience in comparison to the c64 games I played before this.
For example Pirates! for the Amiga and Atari ST was great fun also, but I bought the remake and enjoyed the various improvements upon the original, likewise with regard to the original Civilization vs the latest editions. Galaga was a nice game for its time, but I greatly prefer the more modern looking and more complex feature rich Warblade remake by Edgar M. Vigdal. If I would show the original Galaga, Pong, Space Invaders to youngsters probably they wouldn't be much interested at all.
