Is there any reason why you want to know this besides curiosity?
I mean, it is a beta, of course I'd expect bugs in it. Of course it is playable, too, otherwise a beta release for testers to test wouldn't make sense.
In addition, it is also fantastic because it shows what features are in stock for the next Orbiter.
Sorry, but IMHO this poll is pointless. Perhaps I've missed a valid motivation, though. Could you please elaborate?