Yes it was terrible
I saw all the comments about how bad it is, and I thought I would give it a chance because sometimes I like movies that most people did not like. I also thought, I don't want to miss out on a shared experience of seeing a bad movie made by a master filmmaker especially because this was something he had wanted to make for decades.
It was painfully bad to sit through, it actually made me a little angry how bad it was. I wondered if the actors knew how terrible this was while they were making it.
Maybe if I were a Roman history buff and I could see how this was about the Catilinarian conspiracy of 63 BC (as mentioned by another poster here) I would have enjoyed it.
Maybe this movie will mean more years later in retrospect. I just know that I did not enjoy the 2+ hours I spent viewing it yesterday. It felt very pretentious, maybe in 1977 (when Coppola first got the idea for this) it would have hit better as in those times the audience was more accepting of trippy experimental films. For me it was agonizing.