Just saw this episode for the first time this evening, and I was actually pleasantly surprised. It has a flow to it not unlike most golden era episodes, a great musical number, and for once everyone is nicely in character. I also liked the feeling of continuity with Homer revisiting Springfield University and meeting up again with the nerds from Homer Goes to College. Even the seemingly far-fetched premise of Bart becoming a faith-healer was tackled reasonably realistically (as Lisa pointed out, the metal bucket only came off Homer's head because the bright light caused it to expand, and as Bart was called on as a last resort to cure Anton Lubchenko, at least there wasn't the kind of of cop-out miracle solution that I was initially dreading, like when super Maggie saves Homer from drowning in Hello Gutter, Hello Fadder).
Of course, it wouldn't be Scully if we didn't have to suffer the typically tasteless scene of Lubchenko's broken leg coming off and the fans using it as a victory souvenir with blood dripping out of it, and the somewhat lame ending of Dr Hibbert oddly still believing in Bart's healing powers. So unfortunately my rating had to go down a grade or two because of these flaws.
But anyway, it's a B- for me. Best Season 11 episode IMO after THOH X, Days of Wines and D'ohses and Behind the Laughter and a rare beacon of light in an otherwise murky sea of poor to mediocre episodes.