I am going to preface this with the fact that I played GW1 extensively and have prepurchased GW2 already. I've played a significant amount of mmos...
The game is fun, when I initially opened it up... I hated it. This game is being hyped like the second coming, and it does not deliver that level of quality. The events can be VERY grindy. Yes, my quest isn't to kill 12 boars... but the characters around the dam had to kill like a hundred harpies. Give me the quick kill 12. Not all of the events were grindy, but many were. Collecting the apples... ugh. I am sure this will be fixed after this beta, but the human starting area's xp gains were botched. You could not keep up with your story quest if you just did things normally.
The overflow system they talk about SOUNDS cool, but it is really a bad version of having different zones for areas. It isn't intuitive or easy to group up with your friends because of the overflow. also, there is no way to quickly switch between overflow and the main zone, or to know if you or your friend is in overflow. I truly hope this will be fixed.
I didn't enjoy the game until I put about 10 hours in (I was on my 3rd guy) and I grouped up with a bunch of friends and we just explored higher level areas. We were 5-10 lvls down, but in a group of 4 or 5 we were still clearing it fine. THAT is something cool, that many weak players can defeat a strong enemy. We killed the swamp behemoth thing... it was epic.... until the only loot I got was like a couple teeth. I had a lot of fun with my friends, but the game, as of now, is going to have a hard time keeping a lot of interest... no raids, no dungeons until lvl 30, and very grindy quests. My buddy wrote a review on it for his website, http://clicktorespawn.com/reviews/19/guild-wars-2-beta-weekend/ .... he curses a lot... the beginning isn't his finest work, but he does articulate some good points.