I have had the problems most other folks have had from launch, i.e guild chat lag etc/no trading post, and initial issues joining my guild.
However I am pleased to say yesterday (Tuesday 4th Sept) these issues had all gone and the game played well. So thanks GW2 for the hard work done fixing issues caused (in part) by massive ongoing demand and the sheer numbers of players online.
One modest point, if you start to play a Karma event on an overflow server, and half way complete, transfer to your main realm, you get no Karma credit for what you have done. I can live with that but it may be a point to bring to your attention