here's one area where SOE has actually done something good - you can't gimp your toon in this game no matter how hard you try...at least not in a permanent fashion.
I like the comparison of the Trandoshan and the melee classes is a good one. Zabraks are good at professions requiring mind and agility (medic and bio engineer). Wookies have a slight bonus to the scouting/ranger classes. Humans, like any other game are plain average.
The thing is, if you ever want to go Jedi, all of this means nothing as you'll have to go outside of your comfort zone and racial bonuses to complete all your holocrons. But if you just want to become the master of a profession, look at the above and you're in good shape.