In Deadly Alliance the weapon combos where pretty much horrible or non-existant. In Deception they should be revamped. What I hated with Deadly Alliance was that it was hard as hell to impale your opponent.

There should be a combo for each character so that you can impale at the end. You should also be able to take the weapons impaled in your opponent out.

There should actually be combos instead of just single moves that cause damage. No characters should have the same weapons like Scorpion and Kenshi in the last game.