I didn't like this book as much as the other two. For starters, I'm just not that as into stories where the entire universe or galaxy is at stake. But I can deal with tropes I don't care about as long as they are done well but I just didn't feel any sense of urgency at the end of the story. I mean, you have this device that's sucking up whole solar systems, wiping out entire species and Data just doesn't seem to give a shit. He's on that ship to try to save a guy to save his daughter and when he finds out he's needed to save the galaxy I didn't see him stepping up the pace on his issue. I liked the Data part of the novels until the A and B stories merged. I liked the Wesley part of the story more than I thought I would.
I rated this above average because, hey, it's still a David Mack novel and apparently he just can't write something that's not a page turner for most of the book, it just fell apart for me near the end.
For me, the biggest issue was scale. It was all so big, so huge so incredibly out there in terms of the size of destruction, it seemed to unreal. And I cared less.
But, like you said, Mack writes a page turner. You want to know what happens, but for me, not so much the story this time, but what happens to the characters. And I find that much more important really.