The Lesson: Yeah, the Trek series isn't exactly supposed to be dark and dangerous, but the films - and some of the series (DS9, anyone?) managed to deal with serious subjects and bleaker themes without losing the entertainment value.
And BSG took this idea to the next level - providing great entertainment while pulling off gritty, epic storytelling.
Have Trek take on the biggest ideas it can, given that it's still got to be blockbuster entertainment, and try not to have it shy from pointing fingers where it can. Trek was never shy about criticising government policy or racism, and the film can benefit from the same forcefulness.
The Example: BSG's brutal New Caprica storyline that launched the third season - casting the heroes of the piece in the same role as Iraq insurgents.