The armour in Excalibur was laughable (and anachronistic, but hey...) and I'm sure that the design team worked for the Warhamster art and design department.
First, Excalibur was released in 1980 - the days of Pac Man and Pong and those who worked on it were almost certainly well retired from design by the time Blizzard was doing anything. Second, those spaulders are the result of form following function and consideration of historical design. They allow range of movement for the shoulders so that an individual fighting while mounted can attack and defend nearly 240 degrees, which in the latter part of the 15th century when heavy cavalry operated with complete autonomy on the battlefield was a real concern. I am not making the case artistic license has not been taken since and that the form has not been exaggerated in most cinema and video games, Excalibur was trying to make it look aggressive because in 1980 fantasy was a pretty goofy genre and they wanted to be taken seriously. It worked for the time and since holds up fairly well, your opinion to the contrary.. Like or dislike it that is all well and fine but saying it didn't exist is what is truly laughable.
Warhamster refers to the Games Workshop game, "Warhammer" or "Warhammer Fantasy Battle", released in 1982. It is not WoW.
Yes, I'm aware of what armour design is for and how it evolves, but 'Excalibur' is anachronistic because the Arthurian Legends are supposed to have been about Arthur and his knights fighting the invading Saxons. Most commentators place the legends firmly in the post-Roman Britain period, where mail was the ultimate in armour protection. Later interpretations (especially Hollywood) generally go for High Medieval, C14th, but the Excalibur film decided to go for a look that was late C15th and using almost exclusively the Italian style of armour - big slabs similar to siege armour rather than decorative field armour as seen in the Germanic style.
All that aside, the armour depicted was just ... daft. Bits hanging off here and there, and pointless spikes, knobs and studs. The fight scenes are hilarious. The armour was based on museum pieces, certainly, but then dressed up by a Hollywood designer who thought that the armour didn't look "real" enough.
