Depends on how you view Daniel and the rest of the Bible. Three options to choose from:
1) If you view the book of Daniel as an imperfect history book, produced by a misguided Jew, then it's a joke. You can safely ignore it.
2) If you are interested in apocalypticism and view the writer(s) of the book of Daniel to have been sincere, perhaps producing the book as a teaching aid, then you should study the book to get behind the psychology of the writer(s) and compare the writing in it with similar apocalyptic writings.
3) If you view Daniel or parts of it as being divinely inspired, even though having indergone a drastic editing process and multiple revisions, then it would be worth your while studying the book.
I personally believe the book, or parts of it, to have been written by a Jewish exile, called Daniel. The majority of it contains prophecy and is definitely worth my while to study.