This game not only featured go-karting in the form of mini-game Motor Kombat (it's what fans always wanted) but it also featured 62 fighters. SIXTY-TWO. All of the Kombatants from previous games, plus two! That's an insane amount. How did the developers find room for all those move sets? Well the answer is, they butchered the fatalities.
The system was overhauled for this entry, as instead of watching a cinematic cutscene, we were forced to string together a series of relatively tame generic attacks (bone rip, arm break, neck break etc.) into a sequence of moves that would - if you got all the inputs right - end in an Ultimate Fatality. Fans hated it, and it was scrapped afterwards never to be seen again.
Just watch the video and look how rubbish they are - how was this ever thought of as a good idea?