I understand why you'd say that about those, but Revelation is interesting.
Revelation 1:1 says that the contents of the book is presented "
in signs", indicating that the book is symbolic in meaning -- it's the only book of the Bible which makes such an opening statement.
Most people
don't read that verse, and hence, take it perfectly literally throughout.
The challenging aspect of Revelation is that it forces one to abandon orthodox contemporary thinking in exchange for rigorous cognitive exercise and abstract consideration to properly ascertain the not-so-obvious meaning laying deeply below the surface. Its an intellectually challenging exercise not easily embraced by those not equipped to handle such a tall order.
Personally, I love the book of Revelation...because the meaning isn't glaringly "obvious".