I'd say that depends on whether you're enjoying it or not. Or alternatively how much you've read of it – if I had almost finished a book, I'd probably read the rest of it regardless (I just checked and it's a pretty long story).
Since I don't exactly remember I would say I dropped somewhere in the middle of a story. I guess I started disliking P-21 for being mentally unstable, but I still liked others(my favorite one being Glory). So, I might just continue reading it anyway.
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Or alternatively how much you've read of it – if I had almost finished a book, I'd probably read the rest of it regardless (I just checked and it's a pretty long story). 