It’s generally true that watching someone do something you couldn’t do is quiet impressive and entertaining. That’s why speedruns are often appreciated by the community. The level of skill on display almost demands respect. Other equally creative runs can be as impressive (my go to example would be Urben’s ET kills). But runs that are “chaotic” or try to be funny often don’t spark that same level of awe in people, because they could probably do that themselves in-game. So that’s why they tend to be less appreciated (unless you’re a giant like BigMooney or someone). All my opinion of course 
Personally I’m not too bothered about speedruns, but obviously there are some truly phenomenal ones from people like HITMANIST. I tend to more like themed runs or ones with specific interesting new restrictions
One that’s been stuck in my head for ages is Freezer’s snowball run, it’s just such a fun concept