So far, all I can say is "Awesome!" Fortunately, I have not experienced any problems. I was able to log in around 2ish east coast time and played till about 4:30. Logged off and was able to log right back in around 6pm for about 20 min. logged out and logged back in@8pm till 11:10. I have been bouncing around between story quests and PVP--I find both enjoyable and again have not had any technical problems.
My time in GW2 was fantastic! If I had one real complaint I'd have to say it ended too soon.
The world was/is alive with adventure and there are things and events happening around every corner. From character creation/customization to world exploration - there was something to keep me busy the whole weekend. I never got tired of fighting centaurs or brigands and wish I could go back for more! It was simply the best time I've had in an MMO in such a long time.
I had no problems with lag whatsoever. My hubby and I were partied up and the only problem we had was when the server was full and we both got sent to different overflow servers but guess what? There was plenty to do just the same and it gave each of us some "alone" time to explore the world at each our own pace. A-Net is working on fixing it so parties get dropped in the same overflow server so that should be fixed by launch if not by the next BWE.
I created a human, norn and charr and tried out the mesmer, thief, necromancer and elementalist professions and was surprised by how much I loved the elementalist - previously my last choice of the four. Amazing effects, amazing graphics and a truly amazing world with even the littlest of details added.
All in all, a truly amazing time for a beta version of the game.
Bella
Overall, I was very impressed with the Beta and if they make improvements based on the feedback they get--the game can only get better than it already is!