an engrossing atmosphere and storyline
I actually thought the storyline was thé big minus that turned me off. I found it impossible to suspend my disbelief. I mean, at one point I owned quarter of the universe with those warlike aliens. I knew the location of many planets of other races, and had killed all the traders (thus reducing the income of the other races
). Still, according to the storyline, my existence was still unknown to the universe, except to some pirates I had to eliminate. 
Also, in the intro movie of the humans they talk about the humans having an empire. But when you start the game as the Solarians, you only own one planet, and it isn't even Earth! Hello?!?

Perhaps the storyline becomes better later, I don't know. I didn't play the game very long because of that ridiculous storyline. Fortunately I hadn't bought the game myself, but was playing the copy of my elder brother.
Have you played ImpGal1 btw? Now that's what I call good cinematics and storyline for its time. Well at least until you discover you're a cyborg. Then it simply becomes conquer colonize conquer.
Also in the intro animation a space fleet is attacking a planet. That would seem very odd if the Solarian Empire only is one planet or solar system big. Also it would be very odd that until 2327 humanity wouldn't colonize even one other star system, but after that year they would suddenly expand like mad. Also, if they hadn't colonized or visited other star systems before, how could that Brotherhood of Tears have knowledge about those crystals? Truly, the storyline is as inconsistent as it can possibly be...
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