I've heard the Maradonia books are pretty bad. I haven't read one, but I've read an excerpt and it was pretty boring; I couldn't get past the first sentence. They were self-published so you're probably not likely to find them in most book stores, though.
Johnny Tremain bored me, but my dad says it was good I had to read it for school because it "builds character" to read boring books. Keep in mind I'm not usually bored by books I have to read for school (the other one that we had to read was The Outsiders, which I adored). There's also the fact that we hadn't recently studied that point in history in-depth in school yet, so a lot of the people in my class didn't get at least some of the context. I wouldn't say Johnny Tremain is horrible, more of so average it's boring. Boring books are worse than really badly-written ones, though. Badly-written ones you can usually laugh at more.
The Twilight books aren't very well written and don't have a very good message, but I guess they're worth reading if you really like fluff or if you want to snark at them.
Though, you know, there's someone out there who would disagree with each and every one of these, so don't really take what I say as "Books you should never ever read ever even if you don't have similar tastes to artificialGenius". Just consider it as what books I think are boring and don't really want to read again and wouldn't recommend.
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"Well, you've gotta stop selling your soul to the devil. He's just gonna want more and more, it's like a drug."