Well my feelings after a day and a half I managed of the beta weekend:
Positives:
- Seemless play, with the way the questing works you can run into various areas and everytihng just keeps going without the need to stop.
- The game wants and rewards exploration which is nice in the modern day on the rails MMO.
- Graphics are great and really fit the game.
- I like the combat and the evade function, though at times it seems a little sporadic though that may just be my understanding, and I like the self healing thing though that can get a little irritating when you are dying and not able to do anything about it.
- Classes are all rather unique at least those I played. I played Ele, Eng mainly but even experimenting with Mesmer, Necro and Warr I didn't feel like any class was too similar which a lot of modern MMO's suffer from.
Negatives:
- Queue times for WvW? WTF!?! I could never play it because the queues took so long, 3 hours or so and I never got in at one point. Then you get in and it takes 10-15mins of running just to find a fight. It may take some getting used too but it was massively underwhelming for me

That and the queue issue really put me off it.
- As I worried most events are a mindless zerg when there are the numbers there, no tactics beyond keeping yourself alive.
- Pvp in general. I played Heart of Mists and joined the random battles (which was a chore in itself actually getting in) but I just found it extremely confusing and fast paced. This may well end up as a good thing and easier when you understand your class but I was just dying every few seconds and the evade never seemed to work.
- World events are no where near as important or grand as they make out, admittedly I didn't get beyond 10 and things beyond that may become more unique but even at early levels I was expecting a lot and it was underwhelming.
All in all I really liked it. I thought the game was fun to play and enjoyable and that was what I am after. I think the game will benefit if you are playing with others (roll on the Immortals) as it will take away a little from the mindless zerg aspect and in pvp you wont be rolling solo everywhere.
The queueing aspect for pvp was worrying from both a length perspective in WvW (could never hardly play it) and from a wtf is going on perspective in the heart of mists queueing (I just spammed until eventually something appeared after 5mins)
I would like to see the dynamic events actually being dynamic (which might happen at higher levels) and the mindless zerg aspect was a little disheartening but all in all seems a great game and I am really looking forward to it. Though getting so thoroughly owned in pvp in beta has made me reconsider playing engineer and not sure what I will try now.
