As a direct answer to OP, it depends on the film.
I was born in 1999 so I didn’t get to see TPM when it first came out, though I did go see it when the re-released it in 3D and actually got very exited to see the OT 3D and re-release it in theaters. I don’t think I’ve ever been more disappointed in my life. The main point I’m trying to get across here is that I saw all 3 prequel films in theaters as a kid/early teen and the have a certain level of nostalgia for me. That being said they don’t hold up very well.
TPM to me has always been empty popcorn junk for me. I can sit down and watch the film and not be too terribly bored until they get to Coruscant. Then the movie REALLY slows the f*ck down to the point that it’s actually unbearable. Then picks back up when they finally go back to Naboo. Kiddie Darth Vader always bothered me and Jar-Jar Binks is downright insulting but I find it to be at least watchable. The pod-race is fun and interesting (at least the original version, good god did they butcher the pod-race in the DVD and Blu-Ray).
AOTC is completely insufferable. It’s actually worse than seeing blood in your urine. There is not a single thing to latch onto throughout the whole movie dude. ALL of the characters are terrible, all the dialogue is forced and terrible, the plot is convoluted and it’s just boring to sit through. I feel like I’m torturing myself every time I watch it. I pray to God every time I see it that the government will kidnap me and waterboard me just so I can get my mind off of that stupid movie. It’s that bad.
ROTS is a mixed bag for me. On one hand I really enjoy seeing the Emperor “subtly” (big air quotes on that one) manipulating Anakin. The first 20-30 minutes of that film are awesome. The middle act gets a little shaky and starts to fall apart, but it still kind of works. The last hour/hour and a half of that movie just slip right back into mediocrity. The ending of that movie is awkward, forced and contrived. The entire Obi-Wan Anakin duel is overblown and it feels like I’m watching George Lucas jerk off his digital animators, and the Yoda Emperor duel is so goofy, awkward, terrible kiddie garbage in an otherwise decent dark toned movie about a “good”-guy that turns bad. And don’t get me started on the “NOOOOOOOOOOOOOOOOOOOOOOO”. Jesus Christ the end of that movie gives me a brain aneurysm.