Cheesy/bad dialogue and some poor casting choices aside I really don't think the prequels are as bad as they get made out to be tbh mate. In terms of the dialogue noting will ever top the "your momma" joke for being the most cringeworthy line in star wars history.
Personally I find the way the sequels wasted such an amazing cast absolutely staggering. So many great actors and actresses forced in such nonsensical roles and even the leads only have wafer thin character development. Mate, if I seriously listed everything I hated about TLJ I'd end up taking pages of this thread. Nobody wants that to happen, least of all me! so I'll limit myself and make it as abridged as possible because I'd rather not inflict that on you and everyone else!
I just hate everything about it. The plot (or the lack thereof), the endless macguffin's, the stupid and directionless subplots, the useless new characters, the needless separation of the main hero's, the character assassination of Luke, the pointless death of Snoke, the "your mama" joke, the destruction of Hux as a credible villain, the waste of Phasma, the turning of Finn from an interesting stormtrooper in a moral crisis into an utter clown, turning Leia into Mary Poppins in space, the ludicrous nonsense with Admiral purple hair, ect, ect. It's just goes on and on. It not only trashed everything that came before but it spectacularly derailed what was already a very mediocre sequel trilogy and left episode nine with nowhere to go.
That's why I'm so lenient on TROS, Abrams did the best he could in an impossible situation and managed to carve out a fairly entertaining film from it imo.