Which should cost more like 15-20 dollars.
Think about what L4D2 added over L4D.
New charachters, new maps, new guns, ect. for 60$
The only reason people were flipping out is because L4D didn't get any DLC.
People actually complained that there was TOO MUCH change in L4D2, yet in MW3's case which has just as much if not more, people start saying "wtf reskins/bugfixes" or "$60 dlc!"