there are a few channels in avengers addon.

Take time to read this and v1 threads.

For new users, can be daunting but when successful, u will get some good stuff.

vimeo... u enabled some of the default addons that came with kodi "shell"?
that's a good start. the same process will be required when u enable future addons that are not there yet.
to get them, u need to get the repo (repositories) or plugins.
can't explain in a few words - suggest u google something like "best kodi apps", watch the youtube videos to see how to do it.
after watching a few and trying a few times, u will get the hang of it.
like i always say... kodi is the mother of all apps, delicious to look at, not always possible to eat.

superbox can take a bit of time due to traffic congestion, but can be as fast as a few minutes only.
avengers should work...  i tried korean, thai, japanese... most of them work.
u may want to erase everything and do a clean kodi reinstallation.
right after that, do superbox build.
caution - superbox can take up to 2GB memory.
becos it comes with plenty of repos and addons already enabled.

what device u use and internet speed?

yes, follow the steps in his page, it will work.

u may find this video useful too. take note the path settings.
https://www.youtube.com/watch?v=GEkp8kvc1Mo

Tomorrow try Quasar for its awesome HD quality with proper settings...

The Beast build is a mighty fine build and one I ran solely in the past, till he switched to this red colored theme (I don't find it pretty) .. Plus I decided to start from scratch and install the few addons I need, customize a skin I love, shortcuts, etc.. Much better for me this way, I know exactly what goes in and how, updates, changes etc. So if any errors, I can easily troubleshoot and rollback changes if required. So far, zero issues.. (knocks on wood).
Quasar is THE addon and it works with torrent files. Please check out page one.. Info's all there & more. To understand torrents is to understand the Quasar addon.
Not necessarily.. But for finer control of sources to stream from, ranking, quality, etc.. You'll need to dig into the settings and configure as appropriate for you.

Please read the thread.... There are limits to how much we can publicly discuss about such matters here on lowyat forums...

As for "bad" quality.. Well, can't win all battles.. Else, stick to thy Astro subscription.. That's why they charge the big bucks..