They do seem much like "the ramblings of a deluded mind."
Now we just need to build the case for him being deluded.
The book is a start. What else do we have to support the case?
How about that these so called ramblings of a deluded mind that God made part of the Bible? John of Patmos thought they were true enough to commit to papyrus, and back then, that was a huge deal. It was like us going to a financial advisor, to find someone to transcribe your words (most people couldn't read or write, it probably wasn't necessary to be successful). The materials were very expensive and definitely not handy.
So we have a chapter in the Bible that appears to have been written by a man suffering a terrible fever
We have evidence (the book itself) J of P actually believed all of that nonsense. Obviously, he's a nutjob.
That is 100% more evidence to ignore The Book of Revelations. Think of the implications, if you are a person who won't dare ignore The Book of Revelations. You can stop