When you think of a good book, what do you think of? Is it quirky characters? Amazing settings? An epic romance? A tragic ending? Most likely, you think about the plot line: was it good? bad? average? I, however, think that there are several things that play a part in your decision of how a book was, and through a series of posts, I plan to explore them.
Although most would start with the obvious plot line, I’m starting with what you think of a book before you even start it.

The Cover
“Don’t judge a book by its cover,” the old saying tells us, but how many of us actually don’t? Not many, I’m sure. [For most of us, it's not even possible.] I’ll be the first to admit it: I judge books by their covers all the time, and it’s one of the main factors that helps me pick up a book (assuming I know nothing about it).*
We all have different opinions on covers. For instance:

I, personally, like the cover on the right a lot more: it’s striking, elegant, simple, draws my attention; the cover on the left, however, is a little too boring, yet busy, and I find it kind of ugly. Therefore, I think that I’ll like the right book more than the left one without knowing anything about it. On the other hand, you might adore the left cover with all of your heart, but abhor the right cover.
To make it simple: covers matter. And so do
Titles
Let’s face it: most of us would much rather be reading a book with an intriguing title like Leviathan than something boring sounding like Troll Fell. And yes, I pick out my books based on how cool sounding/entertaining/not lame the title is. I wouldn’t even consider picking up a book like Troll Fell because I don’t like the title, so I think it probably won’t be a very good book. And right below/beside the titles are usually the
Authors
I have a massive crush on John Green and a massive girl-crush on Maureen Johnson**. Because of this, I will gladly pick up any book written by either of them [and several other authors] at any given time. I love all of their books, so a new book by them is bound to be amazing, right? And because I have these crushes, I want to love every book ever written by them ever. And the same way, if I’ve read a few books by an author and hated them all, I’m bound to hate their newest book also. So I probably won’t even give it a chance because I already don’t like it.

Summaries
On almost every book, there’s a brief summary of the book. Most people will pick up a book and read its summary (assuming it has passed the cover-title-author test). If a book sounds good from the summary, most people will read it/like it. If it doesn’t, then they won’t. Simple as that.
Others’ Opinions
There are always books that wouldn’t pass our cover-title-author test, but we read them anyway. Why? Because of what others have to say about them.
If my best friend who has the exact same taste in books as I do loves a book, I will too. It’s set before I even start the book, so I don’t really have a chance to form my own opinion.*** Also, if John Green says he loved a book, I decide that I will too because I love John Green, so I have to love the same books he does. Likewise, if my favorite YA book blogger gives a book a 10/10, it must be fabulous, so I run to a bookstore to purchase it without knowing anything about it.
There are also books that we would be drooling over because they pass the cover-title-author test with flying colors, but our best friend/author crush/favorite blogger hated it, so we automatically do too.
Others’ opinions don’t give us time to form our own opinions of things, or we alter our opinions so that they’re not as extremely different from others’.

Conclusion
Covers/Titles/Authors/Summaries/Other Opinions matter. We care about all of these, whether we embrace it or deny it, and our opinions of books form before we've even begun to read.
-SilverLining
*Just a sidenote on covers: Steph Su has a feature on her blog called Cover Lust where she finds the most amazing covers and posts them up for all to see. I suggest checking it out.
**The author; not the character from Rent. And I do realize that this could be considered really odd/creepy. What I mean is that if she ever asked me if I wanted to hang out/be best friends [which I realize is highly unlikely], I would say yes without second thinking.
***This [and the next examples] isn’t really how I think, but some do.