A forum poll hardly represents as a sample of the people who bought the game.  It only represents people who bought the game, browse the forums, and decided to take the poll.  Statistically speaking it's a horrible way of surveying since it tends to draw only people who feel strongly one way or the other about it, wish to express that view, and use the forums.  Given that only a small percentage of people who purchase a game use the forum I take that poll with a HUGE grain of salt.

I can only speak for myself, but the money i paid for this game was well-spent. If i spent it on movies for instance i'd get far fewer hours of entertainment out of it. The game keeps me occupied several hours a day ever since it came out. That's not to say its flawless of course, i'm looking forward to many improvements, but what's already there is enough to keep me entertained.

IMO it is worth 50$ and getting better every week. I wouldn't be playing so much if it were not.
It has a whole lot more working content than many full price titles. The problem is that people are pissed that it promised a lot ^2  and doesn't deliver that - quite yet. =P