Ahh, I watched this over the New Year and loved it! I agree, the characters (especially Erin, I think) can be mean in a way that usually gives me second-hand embarrassment, but the show is such a delight. I loved the twist with Claire! (I, too, was a wee lesbian at an all-girls school, so that scene with Erin was... oof.)

Sister Michael is amazing and I love her so, so much. Also, Erin's dad! I almost like the scenes with Erin's family, especially her dad and grandpa sniping at each other ("Why don't you leave my Mary alone?" "Because we've been married for 17 years!") more than the ones with the main 4 girls (and James.)