Let's see how many there actually are, not counting the handheld ports:
Mortal Kombat
Mortal Kombat II
Mortal Kombat 3
Ultimate Mortal Kombat 3
Mortal Kombat Trilogy
Mortal Kombat 4
Mortal Kombat Gold
Mortal Kombat: Deadly Alliance
Mortal Kombat: Deception
Mortal Kombat: Armageddon
And the spin-off Mortal Kombat vs. DC Universe, which I don't count either.

I've heard complaints about them using the newer version of the character and not the classic. What's everyone's view on that?