Metal Gear Solid 
Metal Gear Solid: The Twin Snakes Sound Comparison I recently got my hands on The Twin Snakes, and for the most part, it's better than the original; the graphics update really, really helps. I'm usually not one to care about graphics, but old 3D graphics do not age well at all. TTS updates the game mechanics so it's basically MGS2 transplanted into Shadow Moses; basically a recipe for awesome.
What bugs me though are two things: the voice acting and the music. TTS has mostly the same voice actors, but for whatever reason, Naomi and Mei Ling talk in American accents, and Naomi seems flat and lacks all emotion. At least Campbell pronounces "shaman" correctly this time.
As for the music, it's still mostly the same as the original, but the boss battles don't use the original "Duel"! Whatever they use in TTS (I think it's boss specific, I recall the Mantis battle having some motifs of "Mantis' Hymn") is completely forgettable. I haven't finished it yet (just broke out of the cell), but so far the music has disappointed.
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Comments
One improvement to the music in Twin Snakes is during the final escape scene in the jeep (which goes a lot more smoothly when you can shoot Liquid in First Person View!). The song takes a lot of cues from the MGS main theme, which I don't think actually appears in the original.
The rest of the music reminds me of MGS2's music, which is bad/odd because the music there was completely forgettable.