"Sucked" isn't a universal unit of measurement, nor is it a term that any two people are likely to agree on. You might think about why it sucked for you, and what you were expecting/looking for. It's a challenging film for many Star Wars fans, who have now grown up with the Prequels and were expecting that kind of aesthetic. Both are equally valid, and neither one 'sucks.' I wasn't in love with many of the decisions made in the Sequels on an artistic level, but as a work of art, I think "The Last Jedi" succeeded since it has fun with the central myth of Star Wars and makes it more human: what would it mean to be the person who 'saved' the galaxy, only to realize you haven't--and you've merely started the cycle of evil all over again?