I'm not really into the whole Marvel universe and I've only seen a few of the Avengers movies, I can definitely appreciate the fandom and the quality of the movies and plots, they're great. That being said, I do not know most of the intricate backstories for all of the Avenger characters, but I really enjoyed WandaVision! I had to ask my Marvel loving friends for some additional info after watching the first episode, but it wasn't hard to follow and I didn't feel "out of the loop" at all throughout the series. Watching WandaVision actually made me want to go back and watch some of the other Marvel movies, like Captain Marvel! I am going to try watching Hawkeye next!
I would recommend this series to anyone who isn't a huge fan of the Marvel universe, or just doesn't know all of the backstories, but can appreciate a well made production with amazing actors and actresses!