Science officers may tinker with technology, and security is best with weaponry. Vulcans as a race may use the nerve pinch to temporarily take out a foe. There are a decent number of options available, most of which a Star Trek fan worth his salt can anticipate. You are given mission objectives, then proceed to secure sqadmates in order to complete them. You basically choose members because of the inventory they hold rather than for any emotional connection or familiarity with the character.
Missions tend to be very linear, but do include primary and secondary objectives.
In general, this can be a fun game. There are a few things that lack polish and could have taken a hint from other games of the type. Levels, for instance, are very maze-like. Here you will find obstacles that require you to traverse the area in almost an exact order. There are a couple of different ways to get from one place to another, but it's not very logical.