I actually really liked the 3D Mortal Kombat games. They were pretty good and I think the series has a lot of potential in utilizing the 3rd plane. In some respects it makes MK more immersive with some spectacular graphics that cannot be portrayed on a 2D linear plane. I mean in 2D you can create a background object with all the detail in the world but not really appreciate it due to its static nature. Here take a look at this MKDA video upscaled to 1080p and see how phenomenal this 13 year old game looks, beating out even MK9 and MKX in some areas.
https://www.youtube.com/watch?v=lBZOITnmNmw>