I am enjoying the demo, shame its only a half but thats no big deal. The pick up from the ruck by the scrum half and forwards is really good, one of my main complaints of Rugby 08 was you couldn't run with the scrum half as he would get nailed as soon as he touched the ball, but thats been fixed. The chip is really good, awsome if you manage to pull it off. I found that there are some different holes appearing in the defence in different places which is cool, although that may be becuase of it being on easy. I cant really comment on the player likeness as you don't really get to see any players close up apart from the 10 maybe? Also I think the AI will be better, this was on easy and they were at least running at you properly and putting in decent kicks.
Few things I wasn't keen on, I wish the lineouts from the previous games had still been there, just pressing one button is a little bit boring, but not a big deal. Also, as everyone says, graphics aren't great, but maybe that will come in the next installment (if there is one).
I think the people who are hating it are those who are playing it as if its 08, we can all just score tries and say everythings the same, but if you go out of your way to use all the new features then its much more fun than 08. I'm definitly not cancelling my pre-order.