I was in the middle of two books the other day. One I had picked from the library because it was set in a different time and place, and we had just finished a great one like that for book club (Cutting for Stone). It was interesting for the first couple of chapters, then got pretty tedious and strange, so I left it and started another one. This one was recommended by a friend, so I was expecting a winner... It, too, was a little hard to get into. But because it was recommended, I thought I'd stick with it and see how it turns out; before I did, though, I went back to the first one, and give it a chance, too... I finished that one, and am farther into the second - the first, while I would not highly recommend, did pull together somewhat satisfyingly. The second is showing more promise - I'll wait till I finish it to declare it recommendable or not.
On a different level, we just got these winners from the library and I highly recommend them!