Terrible, not even close to Deadly Alliance.
The levels on the other hand are better than Deadly Alliance levels since there are stage fatalities and thats a good thing. Im not pleased with the harakiri's though since the CPU can pull it off faster than you can input the fatality. The add ones were a nice touch I actually enjoyed playing the quest mode since it reminded me of a classic game I use to play on Super Nintendo.
The last boss in MK Deception is a pain in the neck, you can't throw him, you can't kick him into the spikes but he sure as hell can kick you in there. MK Armegedon looks exacally like MK Deception...sure hope Ed Boon knows what he's doing this time.