Above average. The "doubting Thomas" scene was the highlight. Jack has gone from being a character I found semi-annoying in S1 to one of my favorites.
So, I wonder if the Island (and the other, err, "places") somehow stay "in place" while everything moves around them? The Earth spins and orbits the Sun, the Solar System spins around the Milky Way, the universe expands...but the Island is immobile and eternal.
I would like that.