Then if you played the game, you know for a fact that every enemy has one execution. If you can prove to me that you can execute wulvers, ogres, nightmares, etc. in two ways, I'll eat my hand. I'm referring to the R3 mechanic, not any other way.
Why am I complaining about this? Because it's not difficult to add one more per enemy. Probably a day's worth of motion capture work. It would break the monotony of doing the same thing over and over especially in certain muspelheim trials where you have to do the executions on 50 or so enemies. It's the same animations over and over. When you play it long enough, you can really see the problem.
You do realise all the other God of War games were the same when it came to executions, right? And by the way, the "attack" is actually called "Executioner's Cleave", and based on how they're performed (With the camera moving in for a good cinematic look), I'd say it's safe to call it an execution. (And it seems some people on the internet agree)
Also I put 42 hours into the game during my playthrough, and not once did I see this as a problem.