Granted.. I'm not sure if you can trust my opinion of such things. I'll read (almost) anything asside from smutty romance novles.
I first picked this one up because I wanted to see how my favorite sci-fi author could do fantasy.. He does pretty good, but this book doesn't show that ;) (if you want to see a decent fantasy book by him, pick up Kingdoms of Light, unless you want perfectly serious fantasy.. then go get a Robert Jordan book :p)
Anyways, I digress (bad habbit.. let me tell you bout bad habbits....), like others have said the book is like the old adventur games. Simple, straight forward plot. Very common character types. And a rather predictable outcome with an abrupt end. With all that said, frankly, the book is STILL better than the DnD movie!
If you want a quick, enjoyable read, pick up a copy. If you want something deep that gets you attached to the characters.. Don't bother.. Try the Wheel of Time series.