I thought it was outstanding. I was rooting for Jake the whole time and it was very cool to see him out of his element so to speak, but fully on board for the ride of his life.
Re: the joke about Brokeback... Bear said, laughing, as they made the snow cave they would sleep in, "this reminds me of a couple of scenes from Brokeback," and Jake replied emphatically, "I hope not!" or"it better not!" Given that they had just finally gotten punchy and relaxed after a day fighting a blinding blizzard of horizontal hail, I could enjoy the humor. But technically, this could easily be seen as a homophobic response. But maybe he also said it based on how hard it was to film the tent scenes in certain aspects like technical things; who knows.
Overall though, brilliant television and great job to Jake for facing down his fears. Massive!