I picked the Other option, because I don't really agree with the full out "hate them" option... or actually scratch that, I just realized the poll is specifically asking about "Map Packs" and not DLC in general.
It's not the DLC that's the problem, it's the complete douchbag way Activision releases them, and the COD community that readily accepts and purchases it. There really isn't much more you can say about a company who cuts the long standing mod community out of the picture then releases half assed and badly over priced additions.
On the other hand I don't think it needs to be completely free like Valve, though that's certainly great and I wouldn't complain. If companies like Bethesda or Bioware give the community the ability to freely create and distribute mods and/or campaigns, but still create and sell their own new additions, then there's nothing wrong with that. Note that for Bioware I'm more refering to Neverwinter Nights, I haven't played Dragon Age yet to properly judge it.