Couldn't wait until then, so I watched it just now: and it didn't disappoint. This was about as far from life-affirming, feel-good viewing as you could get: it was exceptionally confronting and tough to watch, and I think that would apply to just about any viewer irrespective of their attitudinal starting point. It was astounding television.
I haven't had the chance to watch it yet as I was working this evening - will have a look in the morning.
To be honest, I wasn't annoyed or depressed to hear the opinions of some of the participants: some viewers might have wanted to throw things at their television sets, but I appreciated the frankness with which they spoke. The most intriguing part of the episode for me was right at the end when Darren Hassan (the Liberal with the glasses) expressed his discomfort at the way the experience/experiment was, in his view, "emotionally involving us without our consent": he was unwillingly being pulled into a new reality where every instinct would be driving him toward essentially an human understanding of refugees.