Originally Posted by
ZeroBG82
Quan Chi is far and away my favorite character in the series, so agree to disagree on your first point. He's a much better villain than Shao Khan, who is just too one note.
And as to your second point, how so? His job was to destabilize Outworld and weaken it so that it wouldn't pose a threat to Shinnok. And then to make sure that Outworld and Earthrealm beat the stuffing out of each other so that they would both fall to his master quickly and with a minimum of fuss. Which he very nearly succeeded at in the original timeline, and came even closer in the new one. Murdering Sindel takes away a powerful weapon from Shao Khan. Also, perhaps unintended, it opened up Kitana to be turned against her "father" later, which further destabilized the realm. And set Khan up to get his butt kicked by Liu Kang not once, but twice. Remember, in the original timeline Shinnok's initial invasion isn't of Earthrealm, it's of the far weaker, free Edenia that results from Khan being turned into paste in MK3. Or, in the words of Khan himself, "All too easy."
Hell, if anything, the turn the story takes in MK9 with Sindel getting buffed with Shang Tsung's soul power and wiping out almost all of Earthrealm's warriors makes Quan look like a mastermind pimp. Add in the fact that the result of the those deaths ends up being every single one of those warriors, including Sindel herself being added to the Netherrealm's legions. And that it was the last straw that turned Liu Kang against Raiden, got him killed and added the most powerful warrior Earthrealm ever produced to Quan Chi's retinue and I think it paid off in spades.
It's not the beautiful, bald bastard's fault that Liu Kang is just that good, or that that the Cage bloodline was apparently bred specifically to fight gods. These things happen when you're busy toppling barbarian warlords like Khan and not paying as much attention to the pesky humans.