In my opinion, shared with most of my friends, the original l4d is much better than the sequel (l4d2) considered as a fake l4d. We arrive to this conclusion after having played all the campaigns and survival maps of l4d2, and tried all the characters (they are not comparable with the original ones). Some of us don’t understand why designers waste their time making campaigns for this fake sequel instead to work in the original and true l4d. So would be interesting to have different opinions about this subject.