Aside from that, it's perfectly fine to not like everything you read. Everyone has certain tastes in the clothes they wear, the food they eat, and how they spend their time. Reading choices fall in there. Not everyone is going to like what I like to read, just like I know not everyone is going to like what I write.
I've read a lot of books over the years. Some books I've loved enough to read several times (Hunger Games anyone?). But I've come across a few that I struggled to finish. There are two fairly recent book series in which I liked the first book, but then I could barely get through the second one. I have no desire to read any more books in those series. Also, I've read two books that were the beginning of a series. They're both bestsellers, but I didn't like them. One I managed to finish, the other I gave up on halfway through it.
There were several reasons I gave up on those series. For the ones in which I read the first book but didn't like the second, I found the characters had evolved in a way that really irritated me. I actually got to the point where I wanted the bad guys to win. For the other two books (the ones I didn't make past book one in the series), I just couldn't connect with the characters or the writing styles. One was really beautifully written, but I was bored while reading it. And the other, well I was shocked to find it was a New York Times bestseller. I couldn't figure out exactly why I didn't like it when I read it (this was a few years ago, before I started writing), but I read a review of that same book today that expressed exactly what was wrong with it. Basically, the main character is a Mary Sue and she bugged the hell out of me, and the whole plot was full of cliches.
So have you ever given up on a book or a book series? If so, what made you quit reading them?