My experience is limited to one campaign (hopefully I'll get a chance to play another someday!) but here is what I came away with. The party was:
An Arkanian Force Adept (dark side) with a Sith Sword for melee
A Trandoshan mercenary built mostly with Soldier levels
A Duros pilot built with (I think) Soldier and Fringer
An Arkanian "slicer" (played by me) built with Tech Specalist and Scoundrel
A Kel Dor "scholar" built on a horrible multiclass of Fringer, Force Adept, Noble and possibly something else.
An assasin droid (custom droid model) with a sniper rifle.
Long story short: the dark force adept owned most combats. The assasin droid could snipe anything but few of our combats were such that you could not charge to melee range (a side effect of most of our campaign being played either on board spacecraft or in the back alleys of Courscant). The Duros obviously took center stage in our space combat (I was the backup pilot) and in those cases the force adept usually just manned a turret. But the force adept's combination of melee ability and force powers (admitedly they were the nasty dark side powers

) let him clean up in most character scale fights. Even the Trandoshan soldier couldn't keep up ... the lizard was tougher but the force adept was deadlier.
Out of combat: well the Kel Dor was set up to be our diplomat but he usually spent the first half of any conversation rolling Sense Motive checks and passing secret notes to the DM related to his mental force powers. He would come in near the end with some keen observations about whoever we were talking to gleaned from a mixture of mundane skills and force powers. I shudder to think of what sort of holy terror he could have been in social situations if his character had been built by a munchkin (like me) instead of a roleplayer. As it turned out most social situations would up being dominated by me (with bluff) and the dark force adept (with intimidate ... backed up by "persuasive" use of dark side powers).
Now its entierly possible that much of my experience was derrived from the particular roleplay dynamic of that group of characters (the droid took orders like a ... droid. The Trandoshan limited most of his conversations to emotive grunts, the Kel Dor spent all his time being quiet and mysterious and the Duros only wanted to fly the damn ship. Thus the slicer and the dark force adept became the party leaders

) but the force user really seemed to be able to either equall or beat any party member in any area except piloting or computer use/crafting. And I
know that part of the reason for that is he avoided those skills because there were other party members devoted to them. I can hardly imagine what things would have looked like if he had had a lightsaber and all the other Jedi goodies.
So yeah, the Jedi classes are straight up more powerful than the other classes. Maybe that is the way it should be, this
is Star Wars after all.
One last aside. Tech Specalist is by far the weakest class in the game. The best thing I ever did for my Tech Specalist was multiclass to Scoundrel. There is very little a straight Tech Specalist can do that a straight Scoundrel or Fringer cannot do nearly as well ... and a Scoundrel or Fringer gets a lot of other bennies besides. I could go on but I don't want to hijack.
Hope that helps.