3/5 for 'Opperation: Anihilate!' and 4/5 for 'Vulcan's Vengeance'. 3.5/5 overall.
+1 Engaging plots. Preferred 'Vulcan's Vengeance' to the AOS version of 'Opperation: Annihilate!', though
+1 Ethics and anti-violence themes, especially from Kirk and Spock in 'Vulcan's Vengeance' (which opposes war, the concept of vengeance, genocide and the Good vs Enemy binary).
"Vengeance is never a result of logic"
-Female characters:
+1 Security Lieutenant Zahra with the pant uniform (that every female Starfleet officer would be wearing if we had logic and practicality in mind instead of obsolete sexism) and with an active role on an away mission in 'Vulcan's Vengeance' (piloting, fighting).
-1 All other women (including Zahra in the first story :/, who otherwise also has an active role in an away-mission) in the illogical, double-standard sexist uniform minidresses. In away-missions. Being Security officers. Fighting. OK *facepalm*
-1 Uhura didn't do much. Appeared in her role as communications officer in both stories, but mostly there to worry about Spock's issues :/ (also featuring lack of communication thanks to Vulcans' repression of emotions "I do not fully understand your concerns...I will endeavour to alleviate them as circumstances require"). Her relationship isn't the most important thing about her! And women aren't here to primarily deal with their male partner's issues, stop writing them as doing that all the time! I mean, I generally like Spuhura, but I hate the way they focus on that too often :/ (thanks Beyond for improving on that issue)
-Other characters:
+1 The characterization of all main characters is generally well depicted
+1 Bones' presence and snark is always 100% welcome :D
"Jim, when we get out of this, remind me to check on my transfer to that clinic back in Huntsville...the one without the fear of imminent death" xD
+1 Hendorff insisting that Kirk don't call him 'Cupcake' every time he gets a chance xD
-Random thoughts:
-1 Vulcans being problematic: There's a problematic scene where Spocks threatens to force mind-meld in order to get information from a Vulcan science vessel officer :/ :S (that's basically the worst kind of assault/invasion you can do to a Vulcan, and illegal in Vulcan society, I'm not sure if I should see it as an strategical bluff, or as a bit OoC from AOS Spock's part that he was actually considering that :S, or just as plain problematic because Spock Prime actually did that in An Undiscovered Country :/). Also Sarek initially intending to destroy Romulus out of vengeance for Vulcan's destruction makes him more morally dubious than expected.
-1 Not that much of a fan of the glorification of the traditional 'happy heteronormative family' in 'Opperation: Annihilate!'. It wasn't overdone, seeing as the story was more focused on Kirk and his brother (and it was nice to delve deeper into Kirk's backstory), but still.
- Incoherence with movie!canon: Winona Kirk didn't die, as is suggested in 'Opperation: Annihilate!', and her job in Starfleet is not mentioned either in Kirk's flashbacks.
- Still not sure if Frank is Kirk's uncle or stepdad (uncle in this version, but incoherence about Winona, so), but what we know for certain is that he's (at least) verbally abusive to Jim and Winona and thinks himself the head of the household and the one who can make all decisions and control everybody :(. Sexism still going strong in 23rd Century's Iowa here :/