Haven't read any of the novels, but read 28 Days Later borrowed that "man-waking-from-a-coma-in-a-hospital" from the novels.
I was reading some commenters from another site, and they were complaining that it didn't talk about why it happened, etc etc. C'mon, it's not a movie. It's a TV series. Let it all play out. Give it some time!
There were a lot of disturbing scenes in this show: the little zombie girl, the female torso crawling through the park, the horse getting eaten...