I'v always wanted to discuss this with a broader Star Wars fanbase but as a 28 year old biomedical engineer I literally know one other person who is IN to Star Wars. There is a huge difference between people who like Star Wars and people who are IN to Star Wars and as such I am usually left with no one to discuss such topics with despite my die hard fandom.
So Lets talk Prequels, Overall I actually liked the prequels, I thought the story was good. I think the actors in the films especially Ian McDiarmid (Palpatine) and Ewan McGregor (Obi-Wan Kenobi) etc. were excellent. I even liked Hayden Christensen's portrayal of Anakin Skywalker even in the face of some awful script writing by George Lucas (I don't like sand etc.) I actually think Hayden portrayed the egotistical sociopath perfectly, he really captured the unstable and reckless personality of Anakin Skywalker. I think most people really came down hard on him because of some of George Lucas's crap writing, but if you look past that I think the character was portrayed correctly.
Now despite liking the prequels (but not as much as the original trilogy, what we have so far of the new trilogy and Rouge One) there are things that really make me go WHY!?
1. The overuse of CGI - I know that some things cant be done with out it and thats fine but I feel CGI was way to heavily relied on in the prequels and as a result when I watch them now they look really dated in some scenes. Most of that is because the vast majority of the backgrounds were CGI, I dont mean like a city skyline etc. but small areas that could have been full built scenes like when Yoda battles Count Dooku in Attack of The Clones, or when they pan over the Clone Army at the end of Attack of the Clones. If the first 5-8 rows of Troopers were real people in costume and CGI was used to fill in the hundreds in the back It would have looked so much better IMO. Real never gets old and never gets dated, I understand that sometimes CGI is the easiest way to go (ships, background city and plant landscapes etc.) but for the stuff that's in your face during the movie as much of it should be "real" as possible IMO.
2. Gungans - seriously, what was George on the day he dreamt up those annoying critters... At least ewoks in ROTJ served a purpose although that is another example of George creating underwhelming Natives IMO. Boss Nass and Jar-Jar just ruin the species as a whole, if they just talked normal or without trying to sound like they're from the Caribbean or Jamaica or w/e Georgie boy was going for it might have been passable but it was just to ridiculous for me and if it wasn't for Liam as Qui-Gon and Ray Park as Darth Maul I wouldn't even re-watch Episode 1 ever again lol
3. Spotty Horrible Script Writing - I touched on this already but some of the dialog that George came up with is just clunky, odd and just plain weird. One example being Anakins now famous meme worthy "I don't like sand..." or the other "I wish, I could just wish these feelings away". Poor Hayden, you can polish a turd but in the end its still a turd and while I in no way thing Hayden is or was a bad actor, I think he did the best he could with what George gave him but unfortunately sometimes it was just straight crap.
There are lots of other small things I do not like about the prequels but these are the main three things that really just make me want to kick George Lucas in the shin sometimes. You've read mine, Now I want to hear your thoughts on the Prequels: