The prequels were by far the worst, just from a movie-making standpoint. Bad writing, bad dialogue, bad acting, CGI that wasn't advanced enough for what they wanted to do, and of course ALL THE WIPES. Those are three of the worst movies I've ever seen, maybe THE worst if you consider the expectations and the resources they had. Oh, and Hayden Christiansen should never act again. Though to be fair, George Lucas also found ways to make top talents like Ewan McGregor, Natalie Portman and the great CHRISTOPHER LEE suck. And please, anyone who tries to tell me that the George Lucas "redeemed" himself with the third movie has fanboy blinders on. It was just as awful as the other ones.
The Hobbit movies I'd say were second worst; the LOTR trilogy is so great and and Hobbit prequel could have been amazing... IF it was kept as one movie. But hey, the LOTR movies made a ton of money, so let's milk the hell out of it and make the SHORTEST book into three LONG movies. I think maybe you could have stretched it to two films since they wanted to include the Dol Guldur stuff (which were probably the best parts of the films). But THREE films? Holy hell. Though I will say that the films mostly look good and Holmes and Watson as Smaug and Bilbo are pretty great.
TLJ gets a lot of hate, and I feel like some of it is undeserved. I feel like some of the criticisms were due to the movie going in directions that people didn't want it to, but I don't think that makes the movie bad. For example, I wasn't crazy about some of the choices that Luke made, but I don't know that any of it ruined the movie or Star Wars in general, at least not for me. That said, I do think the movie had script problems. The whole flight to Space Vegas was ultimately a waste of time. The movie also felt like it should have ended a half hour before it did. And Rey's "training" as a Jedi was practically nothing. But overall I still think it's a better movie than any of the prequels or the Hobbit films.