Credit where credit is due. The Valley of Trials was unplayable for like 10 mins because of lag, but all in all, this was an incredible launch. I wasn’t booted once. No queues. Well done Blizz.
Also I hope a fresh like this happens annually. Just always have a fresh vanilla, TBC, and WotLK at all times going in the cycle. It is the way. 
I have to agree. This launch actually surprised me. Smoothest launch of any blizzard game.
Got in after about 10 minutes of trying at launch. No crashes, no errors, just after that 10 minutes I was in and played all night.
Got frustrated that Horde was immediately locked when I got in but after about 5 min or so I got the faction I wanted.
Then the whole server was on 1 layer for about 20 minutes. That was pretty crazy. All in all, about 1 hour in everything was gucci.