Just picked up Jason about a week ago. I agree with everything Reo says, the low profiling is really annoying, especially against something like Johnny Cage's d4. Coupled with the fact that he has short range unless he uses his extremely slow attacks (which can also be low profiled), he almost feels like Goro. Speaking of Goro, I'd like to see Jason get a little more range on his command throws. It feels like the rest of the cast has solid range on their command throws whilst Jason is lacking unless he uses armored tight squeeze.
Coming from Quan Chi, I definitely think he needs setups like Sorcerer Quan does with the runes. He should have a string that if done while juggling is a hard enough knockdown to safely activate armor, healing, etc without having to send the opponent fullscreen (like with 23); rather than cutting combos short.