OK, I can't figure out how anyone could prefer the original game to this one. The gameplay itself is much deeper and more rewarding, the game is harder, the level design is better, there is more variety, the storyline is more fleshed out, and the controls are better.
The ONLY thing the original has on this is the original soundtrack (this game uses music from both the anime and the first game...and seemingly not during many missions) and 60 fps (which is a big loss, I must say). I honestly have no clue why they couldn't pull 60 fps out this time...
Regardless, OD kicks ass. Great value for $15! One thing that suprised me was the fact that the voice director was Kris Zimmerman (MGS series, Soul Reaver, Grandia II, Sword of Bersek etc etc etc.). For such a low budget release, I expected a truly terrible English dub (as they chose not to use the Japanese audio track this time around), but the voice acting is suprisingly good!