As with any new game, server teething issues will be present and as with any new game from a big company, they are monitoring the data and updating as needed. If you're using a trial to play, it might be worth your while to wait until the initial issues are ironed out before trying to get into a game as it may only frustrate you and cause you to lose time. Things like this should be expected as in-house testing, is very different to a public release even if you try to replicate it.
Stressing the servers and tackling issues as they arise is one of the reasons why they decided to offer early access and a beta before the games proper release date. Staggering the population during this period allows for issues to fixed easier and a better release, rather than everything going wrong at once.
It's like putting out small fires as they pop-up, rather than trying to put out a burning building that's completely ablaze. For the game and the consumer.