The main fault seems to be too many subplots (the race, warring factions & sabotage, AND Tom & B'Elanna's relationship problems), which require the viewer to constantly jump from one to another to the extent that one feels almost as if one is watching three different episodes at the same time instead of just one. In trying to be many things, "Drive" fails to by any ONE thing, and so the show ends up with a "choppy" and jumbled feel to it.
I, for one, would have loved to have seen more emphasis on the race itself- the individual racers, the bizarre vehicles they were piloting, the potential unknown hazards along the race course, etc. (The pod race in "Star Wars: The Phantom Menace" (1999) is a great example of how visually interesting- not to mention fun & exciting- a multiple species space race can be).
Finally, I was rather disappointed that a major Star Trek Voyager event- the marriage of Tom Paris & B'Elanna Torres- happened off screen and was somewhat haphazardly tacked on at the very end! What's up with that? One would think that the marriage of these two major characters would deserve at least a token amount of screen time.
Perhaps "Drive" would have worked better with a little more "breathing space"- as a two part story arc, there would have been more time to explore & develop all the subplots. As it stands, it seems a little rushed & out of focus.