Just look at all the players who roll aliens instead of stock races, that is because the trait system hinders character potential.
Vulcans. make perfect sense that they get +10 melee power, they are very strong. But Federation characters can only melee with a Bat'leth, a Klingon weapon.
Optional traits Vulcan can select; Mind Meld, Nerve Pinch. Sound awesome, yeah! But will anyone who knows Star Trek Online going to pick those traits over Warp Theorist, Astrophysics, Accurate, and Elusive?
No, people who want to play Vulcans roll an alien and make them look like Vulcans.
A couple races do have decent canned traits you cannot get otherwise, but overall Traits need to be seriously reworked so that picking a canned race like Vulcan is worth wild.