I haven't played it in ages, but last time I did it was a blast. I found a neat college dorm that had basically everything you need to survive and made it my home base. I had read somewhere on the wiki or something that in the build I was playing the power went off after a few days, meaning no more water (the build I was playing didn't have rain). So every day I went on raids into the city and collected water in whatever container I could find, along with food and batteries, etc. Its probably the truest zombie survival game I've ever played, and I would definitely recommend it.
Dang, now I want to go player it, but can't be bothered to patch it. Guess i'll just wait for it to get on steam and let the auto-updater do its thing.