They aren't better than other classes. Balance is essential to MMO's, and they won't forsake that because in almost every story, the Jedi is better than the normal soldier. But it's not so far-fetched to think of a non-Jedi to be as powerful as one. We aren't talking about a normal soldier with his blaster pistol. We're talking about the most elite soldiers of the Republic, the best Bounty Hunters in the galaxy, the best smugglers in the world.
I also think we'll see a lot of people not choosing Jedi or Sith as their main. The Bounty Hunter class, especially, attracts a lot of attention.