This is not as good as the first one in this series.
The book gets a bit plodding in the middle, as though exegesis is needed, but then the pace slows to a crawl. Too much is happening offstage of which we get snippets. Perhaps that was meant to keep suspense going as to what is really going on, but if so it fails.
Even at his worst, and this is close to it, Jack Chalker is a good technical writer. So the book is easy to read and mostly well constructed as to events. But the narrative is just that bit lacking in structure.
I would say read it. But if it was a stand alone it would not pass muster, and books, even when part of a series should stand alone. So yes read it, but only if you intend to read the whole trilogy.