The Sega Genesis version of Mortal Kombat outsold the Super Nintendo equivalent roughly 4:1 based on my non-scientific observations.
Play control:
Very accurate control, some combos don't work but overall a good translation.
Graphics:
Pretty good job with graphics, at the time it was above-average for Genesis games.
Sound:
Just OK, the Genesis is capable of much better.
Other Factors:
Somehow they thought they were "protecting" kids by requiring a "blood code" to be entered to unlock all the gore. Yeah, the "blood code" didn't exactly require parental consent to enter. If I had a dollar for every time I had some annoying kid ask me for the code I'd be long retired.