There is now a 3-day free trial. I'd highly suggest it to anyone who is curious.
You're right about the quests being more involved and more interesting. You have to have patience to listen to dialogue and story, but if you do, you find yourself far more drawn into the world than any other MMO.
It is under a lot of development. I think the issue here is that a lot of what they're doing is outside of the norm, so balancing out game play, keeping combat exciting, etc, requires innovation. At this time, the game is HIGHLY playable. Most quests are now running smoothly, with only the odd bug here and there. I have personally only faced one bugged quest, and it was resolved by the GM in 15 minutes. The same could not be said for instances like that in WOW.
I think the most exciting thing about this game is it's future potential. They're adding a ton of new content. By the end of the month the New York location will be fully revamped with new arena's, vendors and more.
The amount of content in the game is sort of baffling, considering most quests aren't just about killing mob after mob after mob*. I've been playing for around 45 hours now and I'm only in the 2nd of 9 play areas, and I haven't even touched the PvP content yet.
I think reviewers are being way too harsh on this game, many are complaining that the end game hasn't been developed. Considering that when most new concept MMO's launched 5 or 6 years ago, the idea of "end game content" wasn't really an issue yet, asking a game that's just launching to have it all figured out on day 1, is kinda lame IMHO. I'd rather see the players have a hand in shaping what the world will be like, and have really good quality content. Honestly if some players are only a month into this game, and they've already rushed through all the content, I'm seriously wondering if they're really the type of player for this kind of game world :/