My comments on Bear's novels are as follows:
Bear's an old-school scifi author, not a plug-and-play franchise writer, so his books being a little more cerebral and harder to parse is unsurprising. Even at the time I knew that people were going to be bewildered, expecting another videa game storybook. I think the space magic and lack of absolute clarity made sense, because it maintains some of the sense of mystery of the Forerunner era, even while exploring it.
However, the pacing of his trilogy was actually terrible. 90% of the notable events shouldn't happen in the last 20% of the book. The last two books especially felt like he lost track of the deadline, and got friendly reminder call that the rest of the chapters were due by Tuesday.
This is why I only read the first one. I didn't like meandering around for 75-90% of the book only for the plot to take off in the last couple dozen pages, if even that. Mendicant Bias going on a rampage probably should have kicked off act two instead of the first some 275-300 pages explaining retcons that didn't need to happen and didn't necessitate that much exposition to justify.