Well as the 90s and early 2000s taught us. Don't try to be a clone of MK or copy the fatalities. You will fail. I think MK is just more fun casually because of the brutality of it. It can be played by more hardcore but since I grew up since the series was new, it was always just having fun with the gore. Other tried to copy it but MK was still a very competent fighting game series and its gore is creative. Characters know how to mix the right amount of seriousness with the over the top goof shit it is.