On a game-by-game basis (excluding CoD4 and IW, as I didn't really play them while they were new and didn't get to really know the maps outside of one or two):
WaW: Dome, Castle, Makin
MW2: Afghan, Favela, Highrise, Quarry, Terminal
BO: Firing Range, Launch, Nuketown, Summit, Kowloon, Hotel
MW3: Resistance
BO2: All of them. I can't really think of a map from the base game that I disliked. Best of the best are Raid, Express, and Standoff.
Ghosts: In stark contrast, I hated all these fucking maps. Can't even think of what would be the "least worst" to me.
AW: Retreat and Riot
BO3: Combine, Evac, Breach, Fringe
WWII: Ardennes Forest, Flak Tower, London Docks, Sainte Marie du Mont
BO4: Militia, Seaside
BO3 had the best maps, while also being the best COD game ever. Haters wouldn't know this.
That campaign alone disqualifies it from being the best CoD ever. It's the only time I've ever had to force myself to finish a campaign for a CoD.