This screenshot is from the patch notes 1.6.5 and I can't quote it. No idea why.
Here's the link to it!
http://forums.elderscrollsonline.com/en/discussion/154426/patch-notes-v1-6-5#latest
Anyways. Why ZoS ever made this decision to make Uppercut's mechanics work like this who knows. There are many times a day where you get some fool who comes up to you and wrecking blow spams you. Half the times I just laugh because they are badly positioned but it varies from class to class. I find wrecking blow spammers harder to fight on my Templar(healer) and NB and easier to fight on my Sorc and DK.
However, let's look at the main issue here.
Channelled Abilities/Cast Time that can be interrupted !
Dark Flare
Biting Jabs
Healing Ritual
Crystal Frag
Unstable Familiar
Summoned Winged Twilight
Rune Prison
Dark Exchange
Agony
Can't think of anymore!
Channelled abilities that CANNOT be interupted
Uppercut (Wrecking Blow)
Flurry
Why ZoS? Why why why why why? It just make's no sense to me whatsoever! In 1.6.5 not many people used stam at all. People were not wrecking blowing for that much back then so it did not matter.People didn't know how to hit so hard. Post Imperial City Patch I can still Wrecking blow for 14-15k easy and guess what? I can't be interrupted unless I'm knocked down. It's stupid. Why did you make the one the hardest hitting single targets abilities non-interruptible? Why this aspect of wrecking blow still remains to this day is beyond me especially when players are so fed up of it. Maybe ZoS have forgotten their own mechanics.
Another suggestion for this would be for when player's use wrecking blow and miss the two handed weapon is so heavy that it keeps swinging round and hit's them selves! (More hilarious than practical)
DC - Chunky Nurse - Chunky Ninja - Chunky Dragon - Fabulously Chunky
AD - Chunky Nurse - Ashenn - Yorkshire Pudding