The plot to the first one was trite enough to ward me off a sequel. I just don't have time to schlock through a zombie game if there isn't either fantastic gameplay or a decent plot.
Admittedly my expectations for plot may have been (were definitely) artificially elevated due to the fact that Amy Hennig was working at Naughty Dog when it came out, so I'd assumed that she'd have at least been involved or somehow rubbed off on the team responsible.