I like playing Black Ops alot in splitscreen with my family, but I miss some of the maps from Modern Warfare 2...
My suggestion is to have map packs from previously released games. If you averaged the price to $1 per map in the pack I know I'd probably buy every one of them. But I won't as long as its $15 for 5 maps, thats just nuts to me.
There should be a way to make the previous maps compatiable with all the other games.. I prefer to play in Black Ops since you can do free-for-all and play against bots too.