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This is another section where the sequel will trump the original, but to fans this is to be expected. As stated above, the fans like destroying the bad guys. Other than new skills and abilities, how else can they make it more entertaining? By making it more shiny. Explosions look like explosions and lightning looks like lightning. The varied and detailed settings of each act of the latter game and it's expansion remain impressive to this day, and the original just cannot compete directly in this regard.
But this topic sports a caveat! While the sequel is unquestionably more advanced in terms of graphics, many fans like the atmosphere of the original. Though animations were stilted and the images crude and unpolished as they can be today, be it enjoyment of 'the good ol' days' or just the preference to old-school gaming (perhaps part of the reasoning behind the popularity of Minecraft) many fans love the style and aesthetics of the original.
Layman's Terms: Everybody wins.