I haven't experienced any ping-related dysfunction in Black Ops 2 multiplayer yet, but to stay safe, here's a quick tip which may improve your matchmaking connections.
In the Online > Public Match > Find Match screen, there's a sneaky little "Search Preferences" option camping in the lower-right corner. It defaults to "Normal," which finds a balance between connection quality and matchmaking speed, but I've found that switching it to "Best" doesn't affect how quickly I can join matches. It also doesn't affect how quickly I can join the dirt, where I often curl up for naps under a blanket of bullets kindly provided by whoever just bunny hopped around a corner and surprised me.
Want to know what we thought of the game? Head to our Black Ops 2 review and join the divisive comment argusation.