Maybe a tad harsh. Then again, that lack of memorability means my main memory of the series is the first had rough edges but enough potential to want to start the second, but I retain barely anything of the story.

Mind, I'm getting rather jaded with many series and trilogies, though I also want to see how the Expanse finishes up. A trilogy seems to have become the current expectation (from publishers perhaps?) where too often just a book or two would fit the story much better.