Sorry to drag this up (though it's only been about a month)...
Hadn't been watching this at all, I'm not really a zombie officianado, but seeing reports here about what a good show it was. Four day Independence Day holiday, three season marathon on AMC, thought I'd at least give it a try.
Just finished up the entire 36 hours tonight!
Overall, I really enjoyed it, and will be watching season 4 when it airs this fall. Now I'm going back and reading the threads (up to season 2), but jumped in here to the latest one to thank those who recommended the show in various "What should I watch now that I've finished X" threads. Probably could have used my time more wisely, but enjoyed it all the same.