I got into the beta through my work. Boss went to the GameStop conference and there was a guy from Blizzard there handing out beta keys so he got me one. Wee!
The goblin starting zone is pretty awesome. I like the story-line they got going on thus far. But since I've joined there's been a lot of problems with the goblin quests. Quest givers disappearing or not there, etc.
The Worgen are alright. I'm still not sure how much I like them as a race. The cinematic they have of you transforming wasn't in yet when I created one, but I don't know. I lost interest in playing the Worgen and went back to the Goblin lol.
I finally copied over one of my characters and one of their premades and have been flying around Azeroth checking out the differences. Slowly things are changing, but it still doesn't feel like they're close to being done with all the bugs I find... I dunno. We'll see!
But thus far? I like it.