Yeah they were all excellent! They were all so well designed that you could play a variety of modes on each one and matches would all play out really well. Many terrains types and sizes too! Even though some were really big, the action always occurred in hotspots so you never felt like you were running around like a headless chicken and the way each one was designed allowed for a variety of tactics and routes to take. Nowadays it's all predictable linear 3 lane sweaty shite.
The map packs of BO were also amazing and kept people playing. Sadly I can't see Treyarch ever reaching those heights again so I'd happily see a batch remastered. Sadly we'll probably get the same tired Nuketown, Summit and Firing Range for the 15th time.