Hang on a sec, don't you go talking shite about the prequels. I mean, I accept they're flawed, but claiming that they're worse the the abysmal trainwreck that was The Last Jedi is just not on.
The Phantom Menace - I firmly believe there's a great ~70min movie hiding in here surrounded by superfluous, badly paced padding. The first 10 minutes or so manages to both establish the plot well and provide some light(ish) entertainment. From there on, unfortunately, the film takes ages to jump to the next worthwhile scene, and everyone spends far too much time on Tatooine doing not very much (I can't even defend the bloated podracing scenes, despite how much fun it was as an N64 game). As disposable comic-grade villains go, Maul is right up there, and his due with Obi-Wan and Qui-Gon makes for a superb climax; by the same token, it could've been that much better without the space battle and droids vs Gungans constantly getting in the way. In short, if you strip away the unnecessary sequences and exposition about midichlorians, you have nice, fun SW film.
Attack of the Clones - I admit, it's been a while since I gave this one a look, but from what I can remember McGregor's Obi-Wan really carries this one. Once it gets going, the plot contains the makings of a properly good movie, and even though the final product doesn't fully deliver on this promise it's still watchable. Annoying teenage Anakin's hijinks with Natalie Portman do get in the way of the important business of secret clone army production and the synthesis of the separatist faction, but so long as it stays on message it's a decent movie. I won't argue that there's a masterpiece hiding in there, but for the most part it's watchable and could benefit from some further editing
Revenge of the Sith - Aside from being one of the most endlessly quotable films ever made, It also makes for fine viewing. Jar Jar and Padme have thankfully been sidelined for this one, Anakin is far less irritating, and there are no major sideplots to get in the way of the soon-to-be-Emperor's scheming. I admit, the last ~20 minutes is not only unnecessary but also spoils the OT if you watch in episodic order (not to mention that the time should've been spent earlier, fleshing out Anakin's fall). Additionally, you also get the impression that this big war has brought about some very un-Jedi-ish traits in a Jedi order that probably should've seen it coming under normal circumstances, and that Palpatine has pulled every string at his disposal to isolate and lure in Anakin. In short: it's great.
On a final note, it's worth noting that many of the plot points in episodes II and III are fleshed out and made more credible in a certain animated series that some of you lot clearly can't be bothered with, but we've already had this argument.