Dead Rising deserves a mention. But I'm also convinced that the script was that bad for a purpose. Turok (2008) had some nasty moments that's for sure.
But still I've said it before: Halo Wars, while certainly not the worst script and there are moments of true greatness, the change of the elites in Halo from 'noble valiant honour bound warriors' to 'evil genocidal savage carnivorus monstrous fiends who aren't very friendly' was a big dissapointment to me. Sure it means that we get the old 'good guy bad guy' thing but at the same time this means that all the effort to humanise the Covenant in Halo 2 seems to have gone to waste.
You know what I might even make a thread about this.....