Who says you are obligated to bitch about the Glory Kills?
And then you proceed to mention they are becoming repetitive.....
I've literally seen people saying they won't give the game a chance because they exist. You yourself keep saying they should be a 'pickup' but they have the chainsaw filling that exact role. They aren't something you do on every enemy because you can - sometimes it's not worth getting close or losing that bit of situational awareness - they're a mechanic you use as needed.
And they're a 'bit' repetitive, presumably because right now I'm in the early game and there's only a few main enemy types. Even with multiple animations from each angle you're going to see the same ones a lot when the enemy forces are mostly imps and those big soldiers. But as a mechanic I have no problem with them. Granted I really like RE4 and RE5 where melee serves a similar role.