It wasn't nearly as bad as we make it out to be.
But...
The reason fans go after Last Jedi is because it's the first star wars movie to blatantly say: "star wars is just a movie." The fans realised Disney didn't care about star wars and thought it was nothing special.
Rian Johnson ignored the previous movies and hand waved away all the plot holes with a 'it's just a f-ing movie. It doesn't have to make sense!' Of course, the fans are gonna take that personally.