Just finished off The Dark Tower series. I really enjoyed the first books in the series (2 is my favorite) but found every book just got worse and worse as it went, and books 6 and 7 were really poor compared to the others.
Same -- I loved 2 and the first half of 3. I thought 4 was just too long. And 5,6,7 were all decidedly different in tone than the first 4 I thought.
If you enjoyed it (or want a better version (shorter) of Book 4), check out the Dark Tower graphic novels.
I just read Patient Zero by ..... can't recall. Good zombie/action read. More to the book than the standard zombie fair.