The Lost Symbol: Not technically bad, but extremely formulaic. If you've read the Davinci Code and/or Angels and Demons, you've read this book already. Here, let me give you the plot summary. Not actual spoilers unless you haven't read anything else by Dan Brown.
A self-mutilating ZEALOT appears!
A genius female SCIENTIST conducts groundbreaking research in a lab unlike any other in the world. And she's hot, because all female scientists are.
Our hero, ROBERT LANGDON, is present at the scene of a grisly crime. Kind of like the old lady in Murder, She Wrote. Seriously, every place Angela Lansbury went somebody died!
The ZEALOT gives everyone until midnight to meet his demands, for no particular reason.
ROBERT LANGDON discovers something hidden in a HISTORICAL BUILDING that nobody actually bothered to notice before.
A GOVERNMENT OFFICIAL chases ROBERT LANGDON through the HISTORICAL BUILDING. This continues throughout the whole book, since the GOVERNMENT OFFICIAL always arrives a few seconds after ROBERT LANGDON leaves.
ROBERT LANGDON reminds everyone he is claustrophobic, as this will become important later.
An OLD MAN tells ROBERT LANGDON that these hidden SYMBOLS have a special meaning. ROBERT LANGDON scoffs at this, because he is a Skeptic(tm). Despite his whole career being about this very thing.
The ZEALOT kills some people, because he is smarter and stronger than armed security guards and government agents.
ROBERT LANGDON solves an ancient puzzle in a few seconds.
Gasp, this leads to another puzzle!
And this one leads to another puzzle!
Wait, we went the wrong way, it was really leading to this puzzle!
ROBERT LANGDON must come to grips with his claustrophobia.
Wait, the GOVERNMENT OFFICIAL was really on our side the whole time? Whoda thunk it?
As time is running out, the ZEALOT is dramatically thwarted and dies painfully.
ROBERT LANGDON solves the final puzzle, revealing that the great secret is hidden in plain sight of everyone in the world.
ROBERT LANGDON thinks about GOD for a bit, because despite being a Skeptic(tm), GOD is pretty nifty.