- last post: 01.01.0001 12:00 AM PDT
Proper gameplay is made before both. After the gameplay is made there isn't much for the multiplayer besides making maps, the UI and balancing the gameplay. There really isn't a reason to spend excessive amounts of time on multiplayer, although the matchmaking system must takes some time. Campaign is what needs all the work, there is so much that can go wrong if time isn't taken. AI needs to be good, it needs to be fun and it needs to run smoothly. The cutscenes and audio probably take a massive amount of work.