Just logged in for the first time for 5 minutes to see if the game ran OK. Don't want to spoil it so skipped everything and clicked next to just get into the game.
For people who care, I have a AMD 955 at stock, ATI 5830 and 8GB DDR3. I'm running at 1080p and it was DX9. Rough fps at human start zone was 40-80 fps on rock bottom low, 30-40 fps on medium and around 20 fps on ultra.
Ultra looked very, very nice IMO. Low there's a lot of jaggies but that's what you expect (could have also been the subsampling). I would like some more optimisation on the minimum fps, but it's not bad at all and very playable. Note I did not try WvW but did look at long view distances. I'm very excited and can't wait to play on launch!