The Black Ops 3 servers are far and away the worst I've ever experienced. Takes a minimum of 10 minutes to find a zombies match, and when you do it's filled with lag. At this very moment, I've been "searching for games" for the last 30 minutes.
Edit: Xbox has told me it's an issue with their servers, not Treyarch's.
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The black ops 3 servers are fine. I don't know about you but I'm finding games in less than a second.