It's totally awesome dawesome for little kids I would imagine. But afterawhile you comprehend that the zombies can't "touch you" so then it takes a lot of the fear out.
It reminded me a lot like "true dungeon" except TD was probably more interactive and challenging for adults and less frightening.
Also went to comic con, but other than the Street fighter II machine that was free to play, it was okay. There wasn't a load of people, it looked really empty and not as many scantily clad heroine costumes as would have hoped for.