The Kindle has totally revolutionized my reading - in the sense that I VERY rarely read anything that I don't LOVE anymore.
I used to go into a bookstore or library, browse, and pick up stuff that seemed good. I still do this occasionally, but my new method is this: If I see a book mentioned that looks interesting, or is highly recommended, I send the sample to my Kindle. I have a huge backlog of samples on my Kindle, so as soon as I'm done with one book I'll have a browse through my list, pick one that seems interesting at the moment, and start reading. When I get to the end of the sample, I delete it from my device. The end.
UNLESS - Unless I can't stop. Unless I NEED to find out what happens on the next page. Then I buy it. (Sometimes I buy it on the Kindle, sometimes in paper - I have a whole different rubric for this!)
I have occasionally been disappointed by this method, but far, far less often than my old "browse and pick" method. When you buy a book or check it out from the library, you often feel compelled to finish it no matter what, or even if you're just mildly enjoying it. The result was usually a half-read book that sits on my nightstand forever, waiting...
Now I don't read anything I'm not completely sucked into, whether it's compelling characters, riveting plot, or beautiful prose. And it's expanded my reading tastes, too!