Ulysses is terrible. Did Joyce establish new boundaries for literature with that book? Sure. Just because he expanded the space for other writers to operate in doesn't make it a good piece of fiction though. It's rough ridin' awful. The story pushed the limits of the amount of boredom that a human being can endure. It wasn't enough to be boring though, he decided to purposefully obfuscate the plot throughout, whilst lyrically masturbating for 700 pages. The fact that he changed literature is the unintended consequence of an egotistical bad person beating the crap out of his readers with a 265,000 word ode to "doing whatever the eff I want, because I'm James Joyce, so eff you!"