I'm sorry but people are acting as if this is the first MMOto have launch issues on expansion ore otherwise let me find you an article from nearly 15 years ago (Yes I've been playing MMO's that long:

First day woes for Star Wars Galaxies
By Matthew Humphries 06.30.2003 :: 9:44AM EDT @mthwgeek

thursday saw the release of sony's long awaited massive multiplayer online role-playing game (mmorpg) star wars galaxies (swg). the release was not without problems, however, and sony's servers were at the heart of the trouble.

many gamers rushed home after buying swg to find that registration just wasn't working. the registration servers were fixed by mid-day on thursday, but players who subsequently managed to complete the sign-up process were then presented with game servers that did not work. the problem was put down to “database issues,” and many people were unable to login until friday morning.

Source: https://www.geek.com/games/first-day-woes-for-star-wars-galaxies-552733/
As you can see all MMO's have faults its a foreseeable thing and crying about it won't help anything the Dev's will be the first to know via tickets which they will then work on, SE has some of the most passionate Developers I have ever met and they just want everyone to enjoy the game, but at the end of the day hiccups happen get over it and move on there's no need for all this drama.