Really the problem with combat that Jade Empire had, which is the same problem that ME1 had, was that the rhythm was weird and it didn't work very well. I attribute ME1's failure to the weapon heat system and the long power recharges, which created awkward pauses, and in JE's case the very simple mechanics and the abysmal AI created, as has been said, enemies who block all the time and enemies who just mash the attack button. The actual ideas behind JE's combat were actually pretty interesting, they just had piss poor implementation. JE's defensive / offensive concept, for example, was replicated in Shale's abilities in DA, to better effect.