I wouldnt dispute that from a purely subjective view. However you cant measure fun and people have different ideas of what fun is.
I wouldnt be wrong If I said you found JEs combat fun would I ? I on the other hand found it simplistic dull and repetative.
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That's why I originally said a game fails if the majority of its players didn't find it fun. If people disagree, that's fine. Fun is subjective. But when the majority of your audience doesn't receive your game properly, then it failed.
Jade Empire's combat is incredible simple. Yet sadly, it is far more interesting than spamming the same button in game like KOTOR. I like turn based combat when it's challenging, and requires strategy. Jade Empire keeps me awake when playing it, while combat is a larger bore in KOTOR.
I would prefer a much more complex system that required more strategy, but I doubt we'll see it anytime soon.
People don't want too many twitch elements in RPGs, but that doesn't mean combat should be easy. I enjoyed titles like Fallout that allowed you to use cover, use action points and movement to your advantge, etc.