I just recently got into audiobooks, although I've always like radio dramas and Big Finish audios. I guess audiobooks have more in common with that sort of media than they do books, for me.
Maybe it's about finding the right audio for your tastes?
I bought a BBC dramatization of a Neil Gaiman book I had just finished, then I bought another read by the author, and found I enjoyed it as much as the performance style. Since then I've stuck mostly with genre titles - sci-fi, fantasy and old favorites like the Black Mask anthologies. Almost all of my audios are books I've already read and loved. I don't think nonfiction audiobooks are for me at all, or even general fiction titles.
I don't know if Overdrive Media makes a tablet app or not, but if they do it would cut down immensely on the WMA annoyance factor, I'll bet. I have a Sansa Clip for audios, and it works with Overdrive very nicely.