I had one of my students, a 56 year old stay at home mom, watch them. She had vague memories of watching the OT back in the 1980s in S Korea.
Despite my advice to watch in release order, she didn't listen to me and ended up not liking the OT as much. She said the CGI looked bad.
At the time, TLJ was in theaters and I showed her a webclam clip of Luke tossing the lightsaber. It took me awhile to convince her that it was real. She thought it was a blooper or fan edit. That's how awful that scene was. It just felt weird to her after watching the end of TFA that the cliffhanger would lead to that.
Also, watching the PT first makes lightsaber moments in the OT not as special, makes hearing the imperial march for the first time anticlimatic, lessens the impact of the Luke Skywalker/The Force theme in the ot because it was used so much in the PT.
A lot of the magic of the OT was how few Jedi there were and imagining how cool it would be like if there were a bunch of Jedi around, learning what the force is and imagining what kind of cool things one could do with the force.
My gf and I watched Rogue One in theaters. she thought it was just mediocre because all the easter eggs and callbacks to ANH went way over her head. She didn't realize Tarkin was CGI because she didn't know who he was. She thought the characters were absolutely dull and lacking in charisma.
Then I showed her TFA, she was surprised at how much she liked it. Since she didn't see ANH it felt original to her. She thought "Wow everything looks so much cooler" referring to the updated designs of the Stormtroopers, spaceships, tie fighters, x-wings, retro 1970s tech, etc. She also loved the Rey character in the first act of the film because she thought the character was very charismatic and likable. She'd probably hate Rey in TLJ because she has a good eye for charisma, ie - she watched Daredevil seasons 1 and 2, then watched Walking Dead after. She told me she was surprised that Shane (Jon Bernthal) was not nearly as charismatic as he was in DD season 2 and commented "I think the actor got a lot better with experience"
I never got to showing her the OT, she didn't wanna watch it. She generally wasn't ever into sci-fi. She far preferred Game of Thrones despite it being too violent for her.