The Expansion Pack's main feature happens to also be its weakest one. I can't imagine any but the most hardcore Trekkies enjoying the pointless, plotless, seemingly endless Virtual Voyager option.
You are Case Officer Thorn. Your mission: find an assassin who has killed a Russian presidential candidate and is thought to be after the President of the United States next.
As far as racing games go, I'm a pretty traditional sort of fellow. Give me something with lots of speed, or great handling, in a setting that's either realistic or sci-fi, and you've got a happy camper here.