They really are. For me they're the books by which all others are measured.
I'm somewhat unsettled by book 4, heaven's river. I think the interesting concepts of the premise have been more or less exhausted in the first 3 books. I suspect that anything coming after will be more or less "things happening in that universe" rather than investigating that universe.
I don't begrudge an author continuing a series - it's guaranteed success after all. But in the ideal sense it would've been nice if the first three books had have stood alone.
He focused a lot on one story line, however the stuff that goes on on the sidelines could have huge impacts for the universe going forward. It is changing a lot though, but tbh. it kinda has to to not get stuck in a loop of "the same stuff happening just in another system".
If he turns that set up into a great story arc, it could be very interesting.
I really wanted to like these since they are recommended so often, and on paper should be right up my street, but for some reason I just couldn't get into them. I probably gave up a little over half way through the first book. Does much change after that point that might bring me around or are they just not for me?