I wasn't engaged by this one either. It was like one of those end of season finales when a tv show is out of budget so they show a bunch of scenes from earlier episodes. I was hoping more of a telling of the legacy of Vanguard or maybe fill some open cracks but it was pretty much just expanding upon scenes in the series which the Enterprise was in, scenes that really didn't need to be expanded upon. The only REALLY interesting part to me was when Kirk and Nogura are in the Vanguard Vault in the moon and when Spock notes how quickly Starfleet buried information on Vanguard.
I think an aftermath story could have been told much better than this. That said, I'm glad Ward wrote it and glad I read it because of the few gems which were in it.