Audience score on Rotten Tomatoes was 47%. It has been widely panned by the consumers. The Box Office for a Star Wars movie was weak. Furthermore, if they are creating a poor product it will eat into the next movie.
Take away the hype, and it's essentially just another Marvel type product, rather than some biblican proportion epic event that it's sold as these days.
The problem with the two movies that have come out, is that you can tell a studio, execes have had their imprints all over it, rather than it being some independent vision. You'll have an exec there who is saying we need a female character here to appeal young girls and be politically correct, we need a robot here so we can make money from the merchandise, and we can't kill this character off because it will eat into merchandise sales. It's all too safe,and it stifles creativity. They've spent so much acquiring the rights to it, that they just don't want to destroy it, and are playing too safe.
The Last Jedi was simply awful.