This is probably my favorite episode since the show went to HD, and possibly for a few seasons before that.
First of all, I love to see the characters wearing clothes other than their standard "uniforms," so episodes set in winter fill the bill nicely.
Second, it's great that we get to see a lot of the children doing kids stuff. Really, the whole focus of the story is around the children.
Third, no surreal Homer antics. No Homer as a movie star, or Homer as a super hero, or Homer as a bodyguard, or...
Fourth, nice classic stuff from the comedy team of Chalmers or Skinner (Chalmskin...)!
Fifth, there was no "B" story was there? It seemed to help.
Sixth, it's nice to see Bart behave as if he's human, rather than some kind of prankster robot.
Seventh, cameos that didn't suck.
The end seemed a little hurried, but that may be all for the better, rather than showing Bart agonizing about bringing the kid back to the orphanarium, etc.
-- R Flowers