I don't know how I managed to watch games on TV back then on our old 21" blurry RCA. Then we upgraded to a 27" Zenith - now that was living!
Television quality back then wasn't anywhere near as bad as it appears in that Jets video I shared.
Old VHS taped likely recorded in EP or SLP mode weren't great to begin with. Stick them in a different VHS player that hasn't had it's tracking adjusted to match the original tape will magnify the problem. Transferring it to a digital format of spurious quality is the final nail in the coffin.
Even watching Shaw on the standard definition channels today looks brutal. The video quality back in the 60's-90's was perfectly fine. My parents have Beta tapes that look as good as the day they were recorded.
Watching some of this old footage looks as though the original signal was grabbed with "rabbit ears." It's the tapes that haven't stood the test of time.
This extends to professional video as well. A good portion of Canadian music videos no longer exist or are of putridly bad quality. For instance the best known existing copy of Platinum Blonde's "It Doesn't Really Matter" looks like this. Just worked with the band last month and have Mark Holmes digging thru his memorabilia trying to find a better one. No luck as of yet.