@chaser324: Pretty sure it is (and always will be) a poor matchmaking pool; most everyone's playing the campaign all the way through with the same 12 people. It makes me wonder how people will complete the campaign if they buy the game a month after release, as you never have to play the campaign again once you complete it (even after Regenerating/Prestige).
Servers seem to be fine now. It looked like there initially was a big issue with how the first tier of the cloud (load balancing a player to a Private Lobby server) operated under load- each server appeared to only be able to have a fixed amount of connections open at once (a quick look at the attempted connections from my machine revealed this), and it looked like they weren't spinning up more servers appropriately, making pure luck a requirement to connect for the first couple hours. However, Respawn/MS quickly fixed it, and everything was perfect when I was playing earlier.
Given that the first-tier servers were only going to get hammered that hard within the first couple hours of release (and stopped getting hammered once people started playing), and I still was able to play within 3 minutes of launching the game at midnight (3 minutes of me hitting enter over and over, though), I'd say the launch was pretty successful.