Also, what the people who can't run the game and so on need to remember is that this is what testing is. Stuff is broken, you find out what is broken, let the coders know, and then sit back and wait for them to try and fix it. The idea behind testing is to find out what is wrong, and make that known. When does it get fixed? When there's time.
In a testing phase, you aren't supposed to get good support. Their interest isn't in fixing your problem, in trying to make things work on your system. Their interest is in finding out problems over all and trying to rectify the underlying cause.
That's also the reason they are handing it out in pieces, rather than everything they have right now. It is to direct what you can test. The want feedback on certian aspects, they don't want people concentrating on other things or complaining about something they aren't interested in working on.
So just remember that if you get a build that's busted on your system. Test it out, see if you can figure out why it's busted, but if the answer is "it is broke and nothing can be done" well then report it and just wait until a new one comes out. Don't get bent out of shape that they won't give you personal support, that's not what it's about in a test.