Great book... my compliments. Can't wait for 'Mere Mortals'.
I do see the point a poster made about Ezri being in command... does seem odd for her to get a state-of-the-art starship as her first command.
The only thing I didn't like is Melora... she's nothing more than a 24th century shut in. Didn't like the character in DS9, didn't like her in the Titan books and I don't like her here.
I definitely hope we're done with the Borg for a good long while after this series. So much of the TNG relaunch has been focused on them. Enough.