That and mace decapitation... they literally used same animation as sword and axe, so your guy is slicing their head off with a mace. What. The. Hell.
Looks fine for me, especially considering the maces I use all have blades? Or at the least, sharp edges through which I could effectively get a magic head slice..
Sadly it's a sign of the times when it comes to game mainstreaming. Little Timmy Consoler has to feel special when he kills something, so the finishing moves are in place so that he can jump around and tell his parents how cool he is. Before he turns his character to center the little arrow in his compass that shows where he needs to go next.
Finishing moves are cool because it makes the game more than just the same slashing animations over and over. But yes, I do like to feel like my warrior knows how to finish a person off when they swing their weapon.
Also, you would rather have morrowind's 'swish swish swish swish swish splach swish swish swish' etc ?
The open world fighting games that they develop for consoles are all about gimmicks. Quick kills are just one of many safe, and easy selling points that they implement to appeal to those who are easily pleased.
It doesn't even have to be for the people who are easily pleased, just that to a lot of people, slow motion fancy weapon moves look cool