Left 4 Dead 
Mortal Kombat vs. DC Universe Overall Comparison As much as MK has the new characters of DC [Joker, Batman, Wonder Woman, Superman etc.] added to the list of original characters [Scorpion, Sub-Zero, Sonya, Liu Kang, Raiden etc.] the game-play was the same.
The story line was interesting due to the question of "How the HELL are we gonna blend these two worlds together?".
Left 4 Dead I found that it was more challenging and intriguing to me even though it was the typical "shoot-em-up" Zombie game. I liked the idea of the Special Infected [Smokers, Boomers, Hunters, Witches] especially the Witches. The idea is NOT to kill her.
Hmmm, interesting. . .
I also enjoy the fact that this not just a single-player game and takes a group effort to beat it. I found that being the infected was REALLY cool and fun.
Anyway, to make a long story short. I enjoy Left 4 Dead better than Mortal Kombat vs. DC Universe.
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And of course Left 4 Dead is better!
On my profile it has justification boxes. OF GAMES THAT ARE NOT RELATED!!!
Besides there's no rule stating that the games being compared HAVE to be the same style!
I just don't like people calling something better than something else when they shouldn't have even been compared. It's like comparing music to someone's foot. But I was never really into fighting games, anyhow.
:)
But the combat system is definitely sub-par, and the AI in every MK game is ATROCIOUS!!! I remember in MK2 how Mileena could throw sai after sai, even though the move requires you to hold a button for 2 seconds. If I had the chance, I would NEVER hire an AI director from Midway.