I was in the same boat, ended up getting it. I really tried to like it, gave it about 12 hours. I followed the missions, talked to the people, etc. I thought the graphics we're pretty bad, the characters had no... character, the storyline was very zombie cliche, the missions we're unoriginal and repetitive, and the gameplay wasn't particularly fun. That sounds harsh, but it's how I felt about it.
I have friends who have enjoyed it though, so your mileage may vary. I wish I could get a refund on my time.