I'm going to say you're wrong here. Did you play dead island? the zombies recoiled at your attacks and trust me they killed everyone plenty.
I do own dead island and no they didn't always lol. I hit a zombie many a time without anything happening actually...with a machete..to the face.
The difference is also that you were usually facing many zombies, so stun locking one in its own animations wasn't a problem.
And yes, they did get stun locked in their own animations at times. There was a time when I stun locked four zombies in a row just hitting them in the face. Each one couldn't move due to its scripted animations.
Only the basic zombies had a chance for that animation as well. None of the boss zombies ever felt recoil (even the thug only felt recoil when hit with a critical hit to the face or recieved a broken arm or something).
The primary difference is still the sheer number of enemies though. It's ok if the zombies are locked in animation sequences since there are eight more behind you still causing a threat.
When you are facing one troll it would be stupidly easy to just repeatedly hit its face and watch its head flail around helplessly.