In a 22 episode season, the midpoint is either 11 or 12. I would argue that narratively, it’s usually episode 12 that seems more like the midpoint.
Going by this rule, you would have the following episodes:
“Angel”
“Bad Eggs”
“Helpless”
“A New Man”
“Checkpoint”
“Doublemeat Palace”
“Potential”
The only episode that really feels off from the narrative midpoint in this new list is “Bad Eggs,” which just feels like filler and has no repercussions on the season as a whole. I agree with most people on here that narratively “Surprise” is the true midpoint of the season, as it kicks off the “Angel is evil” arc of the second half of the season.
The others feel like a final arc kickoff to each season.
“Angel” reveals the vampiric nature of Buffy’s crush, and establishes the danger of Buffy’s circle in the fight against evil, as this is the first time someone is nearly killed due to Buffy’s slayer life. My favorite line is Joyce saying “They think I fell and landed on a bbq fork. We don’t have a bbq fork.”
“Helpless” sets up the rest of the season when Giles gets sacked, but it also shows Buffy’s ability to avert crises even without her slayer strength. She begins to realize she doesn’t need the Council.
“A New Man” showcases the cracks that are beginning to form between the Core Four as Giles sense of inadequacy comes out as he is turned into a demon. It also shows more of the twisted nature of the initiative and Walsh’s distrust of Buffy as the slayer and we get our first glimpse of project 314, which threads through the whole rest of the season.
“Checkpoint” is arguably the best midpoint episode on the list. The Watcher’s Council tries to re-instill a sense of inadequacy in Buffy and she has some inner turmoil to work through, but ultimately she realizes what she knew all along: she doesn’t need the Council, but they need her. This is also the “Glory is a God” reveal, which changes the way the scoobies handle glory for the rest of the season.
“Doublemeat Palace” sets up the Buffy as a working girl trope that lingers through the rest of the season. It suffers from the lack of direction and narrative arc from the season. We also get more of the Willow is a genius without magic stuff, so that’s cool. But as with most of season 6, the episode lacks any substance. In a season of filler episodes, this does not really veer off course from filler.
“Potential” is arguably one of the best season 7 episodes; in my opinion. We see Buffy begin to train the potential slayers. Dawn gets her very own focus and it worked really well. Having her grapple with the possible reality that she could be the next slayer, and then immediately turning that around when she realizes Amanda was the actual potential, was a great way to show the maturity that Dawn has developed this season.