What I like about this game is the MASSIVE single player improvements.
I hated how in JK2 missions would take something like an hour each, and how you had to DOOM it out for a few missions before you got a sabre.
Jedi Academy, not only are the missions shorter (finished most in under 15 minutes), but a lot of them are more creative. I'm thinking the swoop race, and the big worm a-la tremors missions, among others.
All in all less repetitive and much more standable.
Force rage however is rather unbalanced. At max level it takes 20 health off, provides a 90% damage resistance, an insane damage boost, and a speed boost as well. To give you an idea of its power, when fighting the final boss on the dark side, the fight lasted for less than 4 seconds. I swear to god thats not hyperbole either.