I thoroughly enjoyed all three, although I agree with others that the second two were a little harder to get into.
She did a good job of making the AI and science feel real. The character development and depth was also very good. It was easy to care about the characters, and many were likeable in their own way with real flaws, interests, and motives.
The action may not have been the focus, but that was also a strong point where a character driven novel or series often struggles with that delivery.
Overall, some of my favorite sci Fi.