I can't stand the show, but if the Walking Dead had comic book art, it'd be about perfect (with Cleland's sound mod).
There's a ton to do. Awesome strategy but you can just "play" too. HORDE is a challenge to get fairly achievable once in a while and is amazingly well done. I didn't sniff Terminus or Last Man Standing when I had it, either.
WAY deep. Way way deep.
I had The Shadow for a while and REALLY thought I'd love it, but it wasn't as enjoyable as I thought. I actually lit final battle on Day 3. Decide to not pick up another.
If you're looking for depth, there really is not comparison with modern rules vs. 90s rules.