Absolutely! If the author has written it for a general audience there should always be something to glean from it. If it's for a technical audience, and it's to

Absolutely! If the author has written it for a general audience there should always be something to glean from it. If it's for a technical audience, and it's too dense, one may want to find something a little more general interest in that subject before returning to said book. It's also worth it to give up reading a book one started. Unless it's for school, then one should talk to an instructor or fellow students.