I watches the first two episodes of this because I was watching WandaVision and couldn't recall Wanda or Vision from the movies. And in this series favor, if you saw the movies but need a refresher on these two, this helps.
Basically they just take a bunch of clips from the movies involving those characters and string them together. That's it. If you haven't seen the movies you're going to be lost, especially in the case of Vision. I saw the movies (once each) and I was still pretty confused.
I don't understand why they're pretending this is a series instead of just promo material for the series (and perhaps eventually other series). This is something that should just be on the series' website under "extras" or something.
So, it's basically BS. But I did find it helpful in my particular case.