Major advantage with CS:Go, COD4, and UT is that we won't need a strong internet connection.
I'm not sure if you can create local LAN games in Black Ops 2.
Yes you can. Custom games in Black OPs II will be on the LAN if everyone in the game (party) is on the same LAN. All custom games in Black OPs II is P2P. All public games are dedicated servers (their servers). So although not as simple and quick to setup/start as COD4 for example, you can still do Black OPS II on a LAN.