Old Demons (16-18). This short arc is mainly notable for its reunion between Old Friends, when Angel visits with the gang. And that reunion is presented well, for Angel's interactions with Buffy, Spike, and Xander alike. Oh, there's some big fight too, against some Big Bad, and it's fine enough, but it's the character work that shines [7/10]. 
 Freaky Giles Day (19). Giles grows up for a day. Gage (and Brendon!) could have just made this a bit of silliness, but instead it turns out to be a gut-wrenching and powerful story about father figures, love, and trust. [8/10]. 
 Triggers (20). An incubus to fight. This is another story that could have gone wrong, but instead it turns out to be not just an intense look at triggers but also a great delve into the relationships of Buffy and Spike, Xander and ... Anya. [7+/10] 
 Overall, a strong volume of Buffy Season 10, balancing a bit of plot with a lot of character.