If you want to make a case that Scully is better than Jean, this would not be the episode I'd pick.
Anyway, stupid episode. This might be the only episode to fail at the most basic storytelling idea of motivation. Because if you think about it, this episode is so ineptly written that it doesn't give a single reason on why Lisa is in the tap dancing class. Not even a half-assed reason like her immediate swooning over her movie character and wanting to dance the Tango de la Muerte, literally no reason at all. So any attempt at emotion or caring about what's going on is wasted, because there is no reason any of this should be going on.
The rest is lame too. The Bart/Milhouse stuff is a sad retelling of Bart and Ralph's town escapades montage in "This Little Wiggy" which wasn't exactly great to begin with, ending with a completely never before done idea of mocking common cartoon cliches. The Lisa "plot" is made only more annoying by Little Vicki, a conveniently stupid character that can and does nonsensical things for the sake of a gag or plot point. Things like "Vicki"/"Little Vicki"/"But you just said...", cat fighting with Lisa for some reason (major groan), "That's a smile, not an upside down frown", ect, and aside from Ralph her domineering idiocy is the supposed source of humor in this sad story. Other Scullyish conventions of self-tap dancing shoes and Homer's laser eye surgery, not to mention the fact that nepotism reigned supreme with the writing credit, only serve as a reminder that this episode would never have passed even three years ago, and would surprise me still if such nonsense passed even today. A few gags, countable on one hand, are the sum total worth of this episode. D+